<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2022-01-24</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001865701</issuerCik>
        <issuerName>Keyarch Acquisition Corp</issuerName>
        <issuerTradingSymbol>KYCH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001865707</rptOwnerCik>
            <rptOwnerName>Keyarch Global Sponsor Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>275 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>39TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10016</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001869509</rptOwnerCik>
            <rptOwnerName>Zheng Fang</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O KEYARCH ACQUISITION CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>275 MADISON AVENUE, 39TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10016</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Ordinary Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2875000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Class B Ordinary Shares will automatically convert into Class A Ordinary Shares at the time of the Issuer's initial business combination or earlier at the option of the holders thereof as described in the Issuer's Amended and Restated Memorandum and Articles of Association.</footnote>
        <footnote id="F2">The Class B Ordinary Shares reported as beneficially owned are held of record by Keyarch Global Sponsor Limited  (&quot;Keyarch Sponsor&quot;). Fang Zheng is the sole shareholder of Keyarch Sponsor and as such, has voting and investment power over the shares held by Keyarch Sponsor.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Keyarch Global Sponsor Limited
/s/ Fang Zheng, Director</signatureName>
        <signatureDate>2022-01-24</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Fang Zheng</signatureName>
        <signatureDate>2022-01-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
