Background and aim: one of the important factors for citizens' cooperation with the police lies in the social capital of the police, which improves the legitimacy and trust of citizens in the police; Therefore, the present study was conducted with the aim of investigating the relationship between the social capital of the police and the general willingness to cooperate with the prevention police of the Islamic Republic of Iran.Method: The current research is applied in terms of purpose and qualitative in nature, which was conducted using thematic analysis method. The data collection tool was a semi-structured interview with eighteen experts who were selected purposefully. Interviews continued until theoretical saturation. For validation, two strategies of external review and pluralism were used.Results: Based on the findings of the research, three main themes and eleven sub-themes were obtained, and the main themes of citizens' interaction with the police based on social capital are: trust between the police and the people (capacity building for people's participation, voluntary activities of the police, social interaction and use of social networks), fairness in police behavior (police honesty, behavioral justice, legalism and ethical standards) and police empowerment (employee capacity building, police competence, police socialization), which causes the desire of citizens to cooperate with the police for prevention and ultimately improvement of performance.Conclusion: According to the findings of the research, it can be concluded that the prevention police, as the largest police unit, needs to interact with citizens to achieve its goals, and by using the themes of trust, fairness and empowerment, interaction and cooperation with the police can be achieved.