The purpose of this paper is to study the amount and the causes of the social capital of the students at the Islamic Azad University in Mashad. The statistical society of this research consists of the Islamic Azad University students in Mashad as well as the method of examplification containing certain steps along with the selected fields such as: mathematics, geology, computer sciences, development, power, theology, literature, the Arabic literature, the family studies, and Medicine major courses.The samplification volume is carried out based upon Cockran Table and Diagram covering 400 students as well as the accumulation of data and information which is based on the Questionaires.Similarly, an attempt is made in this article, regarding its results, to study and consider the testing of the total average effect theories and the mother studies as well as the students’ residences along with the social capital and the purposeful reliance of 95 % is performed and is applicable to the statistical society. Although the effect of these theories on the social capital is very weak; as the matter of fact, it has a very little influence on the social capital. In other investigation theories such as sex, age, faculty, etc…no meaningful relationship was found.