Abstract: Objective: This study is to explore the motivtational conflict explaining model of physical activity behavior by testing the mediate effects of stereotyping and self-consciousness separately as well as the adjust effects of the demographic variables.Method: Seven hundred and eighty-nine students(age=20.70±1.60;male=408,female=381) from 5 universities in Zhejiang Province finished the questionnaires of motive conflict,stereotyping,self-consciousness,physical activity behavior.The data analyses were completed by using the regression analysis and 3-steps testing for the mediate-effect verification.Results: 1) gender and grade variables have no moderating effects on the motive conflict explaining physical activity behavior.2) Stereotyping variable performs a mediating effect partly in the motivtational conflict explaining model of physical activity behavior.The value of mediating effect explains the 30% of variations in total,and the 2% of variation for the models.3) The public subscale of self-consciousness has no mediating effect in this model,but the individual subscale of self-consciousness has a mediating effect partly in this model.The value for the mediating effect explains the 22% of variation in total,and the 2.8% of variation for the models.Conclusion: The motivtational conflict explaining model for university students mainly predicts the physical activity behavior,by the mediate effects of stereotyping and self-consciousness explained.At the same time,the demographic variables have no moderating effects for this model.