The trading rules of stock index futures refer to the rules that should be followed in stock index futures trading. The full name of stock index futures is stock price index futures, which can also be called stock index futures and futures index. It refers to the standardized futures contract with the stock index as the subject matter. The two sides agreed that on a specific date in the future, they can buy and sell the underlying index according to the size of the stock index determined in advance. As a type of futures trading, stock index futures trading has basically the same characteristics and processes as ordinary commodity futures trading. According to the stipulations in the Shanghai and Shenzhen 300 stock index futures contract (draft for comment), the trading time is "9:15-1:30, 13: 00- 15", and the last trading day is ". That is to say, except the last trading day, the Shanghai and Shenzhen 300(2934.763, 8.30, 0.28%) stock index futures opened 15 minutes earlier than the stock market and closed 15 minutes later than the stock market.

This design is more conducive to the futures market to reflect the stock market information, and it is convenient for investors to use stock index futures to manage risks. Fang Futures Senior Consultant said that the futures market in the United States is trading for 24 hours, while in Taiwan Province, China, it is increased by 15 minutes in the morning and evening, just like the Shanghai and Shenzhen 300 index futures. As a tool for price discovery, futures open 15 minutes earlier than the stock market, which is beneficial to price discovery of all parties in the market. And the closing time is 15 minutes later than the stock market, because it will take some time to digest the liquidity and let the market make an estimate of the next day's price, so as to better play the price discovery function. In order to strengthen risk control, the revised business rules increase the minimum trading margin of stock index futures from 10% to 12%. At the same time, in order to ensure the pertinence of the margin adjustment level of the unilateral stock exchange, the restrictive provisions of the margin adjustment of the unilateral stock exchange were revised. The revised draft stipulates that "if a futures contract has a unilateral market on a certain trading day, the exchange may raise the trading margin standard at the time of settlement on that day".