The mock trading is launched to intensify the testing of stock index futures contract, rules and system and conduct the investor education. During the mock trading, the trading process, settlement process and risk control measures are real, but the trading capital is virtual. The investors must understand that the aim of participating in the mock trading is to learn the ABC of the stock index futures, know the rules and clarify the risks. They should not pay too much attention on the profit and loss of the mock trading or assume the real trading according to the quotation of the mock trading.