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Purpose: In this study, the theory of planned behaviour was used to better understand participation in sport. Method: This study used survey & cross-sectional method. Data were gathered from 360 student's university of Yazd. The collection instrument of data was planned behaviour scale revised. Results: Results from the empirical test of the theory of planned behaviour with students participating in sport activities showed that the items formed reliable scales (up ./75). Pearson correlation test demonstrated that three variables predictor's attitude, subjective norms and perceived behaviour control were related to participation of students in sport activities. The results of stepwise regression analysis revealed that attitudes in the first place and perceived behaviourcontrol in the second place and subjective norms in the third place were the dominant predictors in scale planned behaviour. Independent variables (attitude, subjective norms and perceived behaviour control) accounted for 47.5 unique variance participation intentions in sport. Conclusion:The stepwise regression analysis showed that attitude, subjective norms and perceived behaviour control predictors of explained partly of variance under study variables.