The SSE Composite Index is an index of all stocks (A shares and B shares) that are traded at the Shanghai Stock Exchange.

SSE Indices are all calculated using a Paasche weighted composite price index formula. This means that the index is based on a base period on a specific base day for its calculation. The base day for SSE Composite Index is December 19, 1990, and the base period is the total market capitalization of all stocks of that day. The Base Value is 100. The index was launched on July 15, 1991.

Links:

http://www.szse.cn/main/en/marketdata/indicesperformance/

http://www.google.com/finance?q=SHA:000001

http://finance.yahoo.com/q?s=000001.SS