The Hang Seng Index is an indicator of the changes of blue-chip stocks in Hong Kong and a widely watched index in Asia. At the same time, it is also widely used as a standard to measure the performance of funds. The Hang Seng Index is calculated by the weighted capital market value method, with a total of 33 constituent stocks. The 33 constituent stocks belong to four sub-indices of industry and commerce, finance, real estate and public utilities respectively, and the total market value accounts for about 70% of the total market value of all listed stocks on the Hong Kong Stock Exchange.