<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>126 - Disclosure - Summary of Significant Accounting Policies (Policies)</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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      &lt;b&gt;1.&lt;/b&gt;
      &lt;b&gt;Interim Financial Statements&lt;/b&gt;
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;The unaudited consolidated financial statements of Cybrdi Inc. and subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and pursuant to the requirements for reporting on Form 10-Q. Accordingly, they do not include all the information and footnotes required by accounting principles generally accepted in the United States of America for annual financial statements. However, the information included in these interim financial statements reflects all adjustments (consisting solely of normal recurring adjustments) which are, in the opinion of management, necessary for the fair presentation of the consolidated financial position and the consolidated results of operations. Results shown for interim periods are not necessarily indicative of the results to be obtained for a full year. The consolidated balance sheet information as of December 31, 2012 was derived from the audited consolidated financial statements included in the Company&amp;#8217;s Annual Report on Form 10-K. These interim financial statements should be read in conjunction with that report. Certain comparative amounts have been reclassified to conform to the current period's presentation.&lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;The consolidated financial statements include the accounts of Cybrdi, Inc. and its wholly-owned subsidiaries and joint ventures. All material intercompany balances and transactions have been eliminated.&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).</ElementDefenition><ElementReferences>No definition available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Interim Financial Statements [Policy Text Block]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>4</Level><ElementName>us-gaap_BusinessCombinationsPolicy</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="cx_01_January_2013_TO_30_June_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      &lt;b&gt;2.&lt;/b&gt;
      &lt;b&gt;Description of Business&lt;/b&gt;
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;Cybrdi, Inc. was incorporated on August 1, 1966, under the laws of the State of California. From then to approximately June 2004, we conducted business in the distribution of magnetic media products, primarily blank audio and video cassettes. Due to continuing intense price competition and technological changes in the marketplace for its products, the Company lost its remaining significant customers and disposed of or wrote off its remaining inventory. As a result of these occurrences, the Company concluded that its audio and videotape businesses were no longer viable and some of its product lines were obsolete.&lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;In November 2004, we acquired all of the ownership interests in Cybrdi, Inc., a privately held company incorporated in the State of Maryland ("Cybrdi Maryland"). For financial statement reporting purposes, the transaction was treated as a reverse acquisition, with Cybrdi Maryland deemed the accounting acquirer and Certron Corporation deemed the accounting acquiree. Historical information of the surviving company is that of Cybrdi Maryland.&lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      Cybrdi Maryland was established in 2001 to acquire an interest in biogenetic products commercialization and related services entities in Asia. On March 5, 2003, Cybrdi Maryland acquired an
      80% interest in Shaanxi Chao Ying Biotechnology Co., Ltd. (&amp;#8220;Chaoying Biotech&amp;#8221;), a sino-foreign equity joint venture established in July 2000 in the People's Republic of China (&amp;#8220;PRC&amp;#8221;), through the exchange of
      99% of shares to the existing shareholders of Chaoying Biotech. For financial statement reporting purposes, the merger was treated as a reverse acquisition, with Chaoying Biotech deemed the accounting acquirer and Cybrdi Maryland deemed the accounting acquiree.
    &lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

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 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 805

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 -Subparagraph (a)-(d)

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      &lt;b&gt;3.&lt;/b&gt;
      &lt;b&gt;Going Concern&lt;/b&gt;
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      The accompanying consolidated financial statements have been prepared assuming the Company will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred significant losses and has not demonstrated the ability to generate sufficient cash flows from operations to satisfy its liabilities and sustain operations. The Company had an accumulated deficit of $3,281,009
      and $2,977,443
      as of June 30, 2013 and December 31, 2012, including net losses of $336,008
      and $361,072
      for the six months ended June 30, 2013 and 2012, respectively. In addition, current liabilities exceeded current assets by $3,720,518
      and $3,409,603
      at June 30, 2013 and December 31, 2012, respectively. These matters raise substantial doubt about the Company&amp;#8217;s ability to continue as a going concern.
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      The Company finances its operations primarily through short-term bank borrowings and advances from related parties and/or officers/shareholders. In order to complete the construction of SD Chaoying cultural and entertainment center, approximately $3.0
      million (equivalent to RMB19
      million) of capital is expected to be needed. The Company, taking into accounts the available banking facilities, internal financial resource, and supports from related companies, believes it has sufficient working capital to meet its present obligation for at least the next twelve months. Management is taking actions to address the company's financial condition and deteriorating liquidity position. The following sets forth management&amp;#8217;s plans for dealing with the adverse effects of the conditions:
    &lt;/p&gt;
    &lt;table border="0" cellpadding="0" cellspacing="0" style="border-color: black; font-size: 10pt; border-collapse: collapse; font-family: times new roman,times,serif;" width="100%"&gt;
      &lt;tr&gt;
        &lt;td valign="top" width="5%"&gt;(a)&lt;/td&gt;
        &lt;td&gt;
          &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;margin:inherit;"&gt;
            Sale of housing inventories: Proceeds to be received from the sale of the remaining housing of the two completed residential buildings are expected to amount to approximately $0.3
            million. However, there is no assurance when such sales will occur.
          &lt;/p&gt;
        &lt;/td&gt;
      &lt;/tr&gt;
    &lt;/table&gt;
    &lt;table border="0" cellpadding="0" cellspacing="0" style="border-color: black; font-size: 10pt; border-collapse: collapse; font-family: times new roman,times,serif;" width="100%"&gt;
      &lt;tr&gt;
        &lt;td valign="top" width="5%"&gt;(b)&lt;/td&gt;
        &lt;td&gt;
          &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;margin:inherit;"&gt;
            Rental and management fee revenue from the cultural and entertainment center: Annual rental revenue is estimated to be approximately $0.68
            million per year. Management fee revenue will be charged to commercial tenants at
            3% of annual gross revenue. As of June 30, 2013, the Company has not commenced collecting rental and management fee revenue for the culture and entertainment center.
          &lt;/p&gt;
        &lt;/td&gt;
      &lt;/tr&gt;
      &lt;tr&gt;
        &lt;td width="5%"&gt;&amp;#160;&lt;/td&gt;
        &lt;td&gt;&amp;#160;&lt;/td&gt;
      &lt;/tr&gt;
      &lt;tr&gt;
        &lt;td valign="top" width="5%"&gt;(c)&lt;/td&gt;
        &lt;td&gt;
          &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;margin:inherit;"&gt;
            Additional advances from related companies and affiliates Shaanxi Chaoying Beauty &amp;amp; Cosmetics Group, which is an affiliate of the Company is anticipated to provide up to $790,000
            (equivalent to RMB5
            million) of capital to support operations. Shaanxi Chaoying Beauty &amp;amp; Cosmetics Group advanced $25,647
            for the six-month period ended June 30, 2013 to the Company to finance its operations.
          &lt;/p&gt;
        &lt;/td&gt;
      &lt;/tr&gt;
    &lt;/table&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;The Company may require additional funds and may seek to raise such funds through public and private financings or from other sources. There is no assurance that the above management&amp;#8217;s plans will be realized or the additional financing will be available at all or that, if available, such financing will be obtainable on terms favorable to the Company or that any additional financing will not be dilutive. The consolidated financial statements do not include any adjustments that might result from the outcome of those uncertainties.&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for reporting when there is a substantial doubt about an entity's ability to continue as a going concern for a reasonable period of time (generally a year from the balance sheet date). Disclose: (a) pertinent conditions and events giving rise to the assessment of substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time, (b) the possible effects of such conditions and events, (c) management's evaluation of the significance of those conditions and events and any mitigating factors, (d) possible discontinuance of operations, (e) management's plans (including relevant prospective financial information), and (f) information about the recoverability or classification of recorded asset amounts or the amounts or classification of liabilities. If management's plans alleviate the substantial doubt about the entity's ability to continue as a going concern, disclosure of the principal conditions and events that initially raised the substantial doubt about the entity's ability to continue as a going concern would be expected to be considered. Disclose whether operations for the current or prior years generated sufficient cash to cover current obligations, whether waivers were obtained from creditors relating to the company's default under the provisions of debt agreements and possible effects of such conditions and events, such as: whether there is a possible need to obtain additional financing (debt or equity) or to liquidate certain holdings to offset future cash flow deficiencies. Disclose appropriate parent company information when parent is dependent upon remittances from subsidiaries to satisfy its obligations.</ElementDefenition><ElementReferences>No definition available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Going Concern [Policy Text Block]</Label></Row><Row FlagID="0"><Id>4</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>4</Level><ElementName>us-gaap_UseOfEstimates</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="cx_01_January_2013_TO_30_June_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      &lt;b&gt;4.&lt;/b&gt;
      &lt;b&gt;Use of Estimates:&lt;/b&gt;
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates.&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

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</LabelSeparator><Level>4</Level><ElementName>us-gaap_RevenueRecognitionPolicyTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="cx_01_January_2013_TO_30_June_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      &lt;b&gt;5.&lt;/b&gt;
      &lt;b&gt;Revenue Recognition&lt;/b&gt;
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;Revenue represents the invoiced value of goods sold recognized upon the delivery of goods to customers and service income is recognized when services are provided. Deferred revenue represents the undelivered portion of invoiced value of goods sold to customers. Sales transactions not meeting all the conditions of the full accrual method are accounted for using the deposit method of accounting. Under the deposit method, all costs are capitalized as incurred, and payments received from the buyer are recorded as customer deposits.&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

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</LabelSeparator><Level>4</Level><ElementName>cydi_ReverseMergerPolicyTextBlock</ElementName><ElementPrefix>cydi_</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="cx_01_January_2013_TO_30_June_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      &lt;b&gt;6. Reverse Merger&lt;/b&gt;
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      On February 10, 2005, (the "Closing Date") the Company closed on an Agreement and Plan of Merger (the "Agreement") among Certron Corporation (&amp;#8220;Certron&amp;#8221;), a California corporation, Certron Acquisition Corp., a Maryland corporation and a wholly-owned subsidiary of Certron ("Acquisition Sub"), and Cybrdi, Inc., a Maryland corporation (&amp;#8220;Cybrdi &amp;#8211; Maryland&amp;#8221;) relating to the acquisition by Certron of all of the issued and outstanding capital stock of Cybrdi -Maryland in exchange for shares of common stock of Certron that will aggregate approximately
      93.8% of the issued and outstanding common stock of Certron. Pursuant to the terms of the Agreement, at the Closing Date (a) Acquisition Sub has been merged with and into Cybrdi - Maryland, with Cybrdi - Maryland being the surviving corporation, (b) the common stock of Cybrdi-Maryland has been cancelled and converted into the right to receive shares of the common stock of Certron at an exchange ratio of
      1.566641609
      per share. This resulted in the issuance of
      47,328,263
      shares of the Carton&amp;#8217;s common stock, and (c) each share of the common stock of Acquisition Sub has been converted in to and become one share of the common stock of Cybrdi-Maryland. The share exchange has been accounted for as a reverse merger under the purchase method of accounting. Accordingly, Cybrdi, Inc. will be treated as the continuing entity for accounting purposes and the historical financial statements presented will be those of Cybrdi, Inc.
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;
      In connection with the Agreement, on February 10, 2005, the Company amended its articles of incorporation to authorize the issuance of
      150
      million shares of common stock no par value and
      500,000
      shares of preferred stock, $1.00
      par value per share, none of which are issued or outstanding.
    &lt;/p&gt;
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      &lt;b&gt;6.&lt;/b&gt;
      &lt;b&gt;Income Taxes&lt;/b&gt;
    &lt;/p&gt;
    &lt;p align="justify" style="font-family: times new roman,times,serif; font-size: 10pt;"&gt;Income taxes are provided for the tax effects of transactions reported in the financial statements and consist of taxes currently due plus deferred taxes related primarily to the differences between the basis of assets and liabilities for financial and income tax reporting. The deferred tax assets and liabilities represent the future tax return consequences of those differences, which will either be taxable or deductible when the assets and liabilities are recovered or settled. Deferred taxes also are recognized for operating losses that are available to offset future income taxes.&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

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      &lt;b&gt;7.&lt;/b&gt;
      &lt;b&gt;Recent Accounting Pronouncements&lt;/b&gt;
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