Build a solid bottom line for the survival of derivatives and use a systematic position model to reject speculation and liquidation! This article provides in-depth compliance knowledge on the iron rule of "a single risk shall not exceed 2% of the total funds" commonly used by professional traders around the world, and reversely calculates the mathematical formula for the number of long and short positions. Comprehensive real-life destructive case of starting heavy positions with high leverage and adding floating profits, and details how to use negative correlation short CFD positions to carry out short-term hedging operations for long-term stocks and gold spot positions.