This article is investigating the level of social trust based on social approach. We assume that social trust (as the main concept of this research) is an important aspect at social relations and the cause of social participation among members of society. The main question is whether the level of social trust among students of Zanjan universities, as the pivot of social relations, have relation with personal and situational traits of students, social interactions with social groups, level of social capitals (social security, supporting social discipline, social commitment social anomy, social alienations, social hope, social correlation, social rank, social power, social ability to risk). Results show that according to students there is a keen relationship between some factors affecting social trust (specially social participation, social correlation, social anomy, social alienations, social hope, social ability to risk social security, supporting social discipline, social commitment) and social trust. This relationship between some other factors such as (social rank, social power) has a medium state. Thus, In the ultimate analysis of variations (level of social participation, social correlation, social security) in comparison other variations in Iran have become notable in a way that it has gained the most importance in clarification and anticipation of social trust in impressments of theoretical discoveries of this research, while supporting the relation between social trust and most of the variations considered in minor viewpoints, it is useful achieve perception of major phenomenon which include trust and it is a factor in combining minor and major approaches in the form of a conceptual framework for social trust.