CSI 500 Index is one of the developed indexes. The stocks in the sample space are composed of the top 500 stocks with total market value excluding the constituent stocks of the Shanghai and Shenzhen 300 Index and the top 300 stocks with total market value, which comprehensively reflects the stock price performance of a number of small and medium-sized board companies in China A-share market.

In addition, the full name of msciA50 is "MSCI China A50 Interconnection Index", which is newly compiled by MSCI (Morgan Stanley Capital International Company) and has selected 50 leading stocks included in the Hong Kong Stock Connect.

In order to reflect the overall performance of stocks with different scale characteristics in the market, CSI Index Co., Ltd. has built a scale index system including large-cap, medium-cap, small-cap, large-medium-cap, small-cap and large-medium-cap indexes based on the Shanghai and Shenzhen 300 Index, which has provided rich analytical tools and performance benchmarks for the market and laid a foundation for the research and development of index products and other indexes.