The 3-5-7 Trading Rule is a risk management framework that emphasizes capital preservation, position control, and profit targets. Its core principles include risking no more than 3% per trade, keeping the total risk of all open positions below 5%, and aiming for a minimum profit target of 7%. This system helps traders maintain disciplined operations, promote long-term profits, and reduce losses. It supports flexible risk management and automated execution to enhance trading performance.