The 3-5-7 rule is an effective risk management framework that helps traders survive in the market over the long term. Its core principles are: risk per trade does not exceed 3%, overall risk exposure does not exceed 5%, and profitable trades should earn at least 7%. These rules encourage traders to diversify risk, control losses, and ensure profits can cover losses, thereby increasing trading success rates. Strict adherence to these principles can effectively prevent large losses caused by misjudgments and cultivate good trading discipline.