Abstract: By reviewing the mental hygiene and the mental health criterion, the paper discussed the necessity of the combination of positive psychology and mental hygiene, and proposed the concepts of mental hygiene and mental health criterion of athletes. By summarizing the present research situation of athletes` mental hygiene, the paper, combined with the DFSMH, analyzed the limitations of traditional mental hygiene researches and the effects of positive psychology on mental hygiene. Finally, it listed some problems waiting o be solved in order to offer reference for sports psychology research.

Key words: athletes` mental hygiene, athletes` mental health, positive psychology, the Dual-Factor System of Mental Health