The purpose of this study is to identify the structural relations between social support, exercise attitude and intention in sport participation of college students based on The Theory of Planned Behavior. The study was verified the psychological structure model to strengthen the intention of sport participation of colleges who do not involve in the current exercise, but have intentions to participate in regular exercise with a month. For data analysis, in order to verify the validity of the utilized scale, this study was conducted exploratory factor analysis and confirmatory factor analysis using principal component analysis and verimax. That after, this study was performed a correlation analysis and multiple regression analysis for the variable after validation of the multidimensional relationship, and was confirmed the validity of the model and the structural equation modeling analysis to validate the structure model of this research. As a result of analysis, social support affects exercise attitude positively and exercise attitude influence on the intention of sport participation. However, social support did not directly predict the exercise intention, just only promote the intention of exercise with exercise attitude closely.