Say goodbye to the "Champion's Curse" of blindly chasing high returns, and teach you how to use quantitative indicators like a fund manager to select truly stable copy traders. This article dismantles the four core risk control dimensions in depth: using the maximum drawdown to measure defensive power, using the Sharpe ratio to evaluate risk-reward cost performance, combining the winning rate and profit-loss ratio to understand the underlying logic of profitability, and examining the historical stability of riding through bulls and bears, helping you use professional due diligence thinking to protect principal and weather market storms.