Self-depletion is the cognitive state of reduced resources for self-control, a temporary reduction in the ability or willingness of the self to engage in volitional action (including controlling the environment, controlling the self, making choices, and initiating action) as a result of prior volitional exercise; and self-depletion leads to the self-depletion effect, a phenomenon that occurs when people's performance and performance on subsequent tasks requiring self-control decreases when they complete successive tasks that require self-control.This paper outlines three theoretical models of ego attrition: the limited resource theory model, the ego attrition process model and the motivational intensity theory to illustrate the internal mechanisms of ego attrition; it also introduces the ego attrition triggering task and discusses the measurement of ego attrition to lead to possible subsequent research, with a view to bringing inspiration for subsequent related research.Future research can also explore the core factors of ego depletion to find appropriate ways to improve ego depletion, and can also use positive thinking and other training methods to improve individuals' ability to combat ego depletion.