Why the B share market opens to domestic investors?This paper mainly focused on this question and has given three reasons for the opening policy:first,to activate B share market;second,to take full advantage of inhabitants saving;and third,to .

The China's B share market was launched at the end of 1991, in order to attract foreign investments and hard currencies.

It is also brought to success that the empirical analysis on Shanghai s B share market.

Our country s B-share market is opened to the domestic residents now, Which exerts a far-reaching in fluence on the future of the stock market as well as national economic development, consequently leading to the open-up to the whole world.

After the completion of the reform of the A-share market, the existing problems of the B-share market have caused more and more scholars and investors concern.

A relative A & B stock market index is drawn up respectively by weighting methods in order to receive a relative conclusion before and after the opening of B stock market.

Using the trad ing data of Shenzhen B stock market during January 2002 and December 2004, this paper exam ines the CAPM based on EMH, and the relationship between stock returns and other ex- planatory factors.

Test for weak form efficiency in China s B share;

Does B Share Reached Weak form Efficiency;