Penetrate the changing market conditions of derivatives and use the full-scenario strategy model to reconstruct long-short band arbitrage! This article provides in-depth compliance knowledge on the three main mainstream practical strategies for contract-for-difference (CFD): the iron law of trend following based on the 20/50 period moving average divergence and MACD zero-axis verification, the risk control red line for breaking the horizontal box support resistance level, and the data-driven dimensionality reduction risk control during the non-agricultural and CPI interest rate decision windows. It details how to use the tamper-free historical retracement data and independent stop-loss authority of the intelligent documentary system to smooth the operating threshold of multi-strategy switching.