China's stock market index refers to the Shanghai Composite Index and the Shenzhen Component Index. Shanghai Composite Index: A stock index with all the stocks listed on the Shanghai Stock Exchange (including A shares and B shares) as samples, circulation as the weight (including circulating share capital and non-circulating share capital), calculated by the weighted average method, with December 19, 199 as the base date and the base date index as 1 points. Shenzhen Component Stock Index: The stocks of 4 listed companies with market representativeness are selected from all the stocks listed on Shenzhen Stock Exchange as samples, and the circulating share capital is used as the weight, calculated by the weighted average method, and the base date is July 2, 1994, and the base date index is set as the stock price index of 1 points.