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SHARE BASED COMPENSATION (Assumptions) (Details) (CNY)	12 Months Ended
SHARE BASED COMPENSATION (Assumptions) (Details) (CNY)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option at grant date (RMB)	5.60	6.91	16.85
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.78%
Expected term	4 years 9 months 18 days
Expected dividend yield	0.00%
Expected volatility	80.00%
Fair value per option at grant date (RMB)	5.60

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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