In this article we offer an explanation for price differentials between A and H shares based on the conventional asset pricing theory. We find that the risk premiums associated with the Hong Kong and Mainland Chinese Markets in a two-factor model successfully explain the cross section of returns on the A and H shares. We show that discounts on H shares relative to A shares are highly related to the contemporaneous discounts of H-share local market index relative to A-share local market index, as well as the spread of Hong Kong savings interest rate to Mainland China. The evidence suggests that the risk premiums associated with the segmented A- and H-share markets exert crucial impacts on the price differentials between the two classes of shares. The results thereby indicate that the movements of price discounts of H shares owned by non-Mainland investors in the Chinese stock markets is in accord with the rationality of Chinese investors.