Citizen’s participation in decision-making and urban affairs is one of the important issues in societies. So this study aims to explain some of the sociological and psychological factors that are influential in citizen’s social participation in urban affairs. Research method of this study was survey and to measure independent variables (social satisfaction, social verify, ASSESSING PARTICIPATION CONSEQUENCES, belief in participation, participation experiences and IMPROVEMENT MOTIVATION) and dependent variable (social participation rate), we selected 700 heads of family from Isfahan’s seven municipality zones that was based on multi-stage sampling. These respondents had been chosen as the final sample and filled out prepared questionnaires. Statistical methods included one way ANOVA, Multiple regression and Path analysis. In order to measure the path coefficient, such as total casual effects, indirect effects, standard path coefficients and multiple correlation coefficients for structural equations, we used the Lisrel Method. All of the statistical tests and data were analyzed by SPSS16 software. Results show that most of Isfahan citizens have ae high rate of participation in urban affairs. The other variables such as participation consequences, participation experience and IMPROVEMENT MOTIVATION have been influential in citizen’s participation behavior. On the whole, according to the path analysis, the power of the independent variable in explaining the variable of the dependant variance was 63%. The rest of that, 37%, refers to the effects of other variables that were not studied here.