Introduction: University students will play an important role in the professional development of the country in the future, and they should be familiar and train with professional ethical principles. The present research was conducted to present a model for promoting the professional ethics of students at Islamic Azad University of Tehran province, Iran. Methods: A mixed research method was used to perform this study. In the qualitative section, with the purposeful sampling approach, interviews were conducted with 14 experts in the seminary and the university in order to design the research tool. In the quantitative section, using the multi-stage cluster method, 365 faculty members of Islamic Azad University were selected to respond to the questionnaires. In addition to the documentary and library methods, a researcher-made professional ethics questionnaire, including four individual, educational and research, organizational, and environmental factor with 95 questions, was used to collect information. A content analysis was used in the qualitative section. In the qualitative section, descriptive, exploratory and confirmatory factor analysis tests were used. Results: The results showed that the average variance index for each individual factor (0. 503) educational and research (0. 0527) organizational (0. 523) and environmental (0. 588) with a confidence level of 0. 99 were effective in promoting students' professional ethics in Islamic Azad University. Conclusion: The most important individual, organizational, educational and research, and environmental factors of effectiveness according to the amount of t value on the promotion of student professional ethics are listed below: 1-(Individual) Adherence to religious values, fairness, justice and honesty and having intelligence and moral sensitivity and aware of the impact of their performance on others. 2-(Educational and research) Creating a suitable environment for teaching, learning and improving scientific, social and research skills, seriousness of professors in evaluating and accuracy in students' moral behavior. 3-(Organizational) compiling a charters and ethical codes and emphasizing its observance by principals, professors & students and creating an atmosphere of appreciation for appropriate actions and supporting students' adherence to professional ethics. 4-(Environmental) Adhering to the law and regulations of social, cultural and economic and serious attention to the principles of proper family upbringing and moral education from primary school.