Precious metal CFD trading is not only a technical game, but also a psychological game. This article analyzes the common cognitive biases of traders from the perspective of behavioral finance: the endowment effect and anchoring effect make positions hijack judgment, loss aversion and disposal effect lead to cutting off profits and letting losses run, and overconfidence and FOMO herd effect lead to chasing ups and downs. Understand these psychological traps and use regular tools such as stop loss, trailing stop loss, OCO combination order and position calculator to help traders stay rational and maintain the bottom line of behavior.