The Hang Seng Index is an indicator of changes in the Hong Kong stock market, and it is also 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. The constituent stocks belong to four sub-indices of industry and commerce, finance, real estate and public utilities respectively. The impact of a stock price change on the Hang Seng Index depends on the market value of the company. Stocks with higher market value have greater influence on the fluctuation of Hang Seng Index than stocks with lower market value. In view of the increasing concern of the Hong Kong stock market and the increasing demand for related hedging instruments, the Hong Kong Futures Exchange launched the Hang Seng Index futures contract as early as May 1986.

Operating instructions usually include:

1, market price buying: buy multiple orders at the current market transaction price (buy up).

2. Selling at market price: selling an empty bill at the current transaction price in the market (buying down).

3. Buy at a limited price, sell at a limited price: both are win-stopping passwords, and buy at a limited price; Is a no-win password set relative to a short order (sold at the market price). Sales at the same price limit; Compared with multi-hand buying (buying at market price), this is a password with no chance of winning.

4. purchase restriction; Reverse price limit selling: these two are stop-loss passwords, which restrict buying; Is a stop-loss password relative to a short order (sold at the market price). Similarly, it is limited to selling; It is a stop-loss password relative to buying more hands (buying at market price).