What is the survival rule of stock index futures trading? Stop loss unconditionally at the first time, always insist on it, and don't take any chances. The leverage effect of margin makes the price fluctuation artificially amplified, and the limit of contract expiration makes it impossible to keep the position all the time: when the position direction runs counter to the market movement, the price of time will become more and more expensive; In the case of unfavorable trading, if we don't take correct actions in time, we will often face the following scenarios: (1) The invested margin has just been broken down; (2) The book profit may be completely lost. (3) All capital will face a disastrous outcome because of contrarian trend. It can be seen that if you want to survive, you must learn to stop loss. Stop loss should be considered and set when the trading scheme is produced, and should be tracked and promoted in some way during the trading process. The width of the stop loss is related to personal circumstances, but it mainly matches the normal fluctuation range of the market, and sometimes certain time conditions are attached. As a long-term trader, the size of the stop loss should be able to withstand daily price fluctuations and avoid touching the stop loss frequently, so as to ensure that the operation plan can be carried out effectively under the premise of correct decision.