Attention is one of the core issues in cognitive science.The traditional"capacity limitation hypothesis"is difficult to explain the nature of attention.Depending on the collaboration of psychology,neuroscience and philoso-phy,action-based attentional explanation is becoming more and more perfect.The theory of"Selection for Ac-tion"points out that attention is a kind of select activity for action.It is not only a process of mental information se-lection,but also a necessary component of action,both as a result of cognitive integration and as a corresponding neural guidance activity in the brain.The relevant explanation not only goes beyond the simple understanding of at-tention as perceptual processing in the past,but also clarifies and solves the problem of mental activity through structural analysis.Attention is a basic feature of cognition and an important cornerstone of cognitive science.The successful explanation of attention will provide a key to the mystery of human natural cognition.