Objectives: We will try to put the theory of social capital under an experimental test as the dominant fact in society and also ask the question: is this theoretical approach able to explain the existing fact in the field of social participation in Iran or not? Method: The analyzing method is a combination of library and field method, which in field study, citizen’s population of ages 15 to the upper, inhibited in Tehran were examined with the use of Kokeran formula, and 653 samples were selected among them. The data collected and analyzed with the use of questionnaire and with SPSS software and the use of descriptive and inferential statistical methods. Findings: social participation as one of the component of social capital, in ultimate analyze, is favorable in micro level but because of unsuitable fields in macro level, such as centralization, pessimism about the government’s functions and…, we can not expect the formation of social participation among people Results: we can not see reliability between citizens and the government’s system, and this point, caused the objective aspect of social capital not to form, social interaction, and finally social participation as one component of social participation, won’t be accomplished.