Abstract— Background :The success of Student Competency Test Of Doctor Professional Program (SCTDPP), is one indicator that also determines the success of the doctor professional education. Various factors influence the success of young doctors in the SCTDPP, one of which is a psychological factor. The aims of this study to identify the effect of psychological aspects on the success of SCTDPP . Method: This is an observational analytic with a cross-sectional design. The research was conducted in Faculty of Medicine and Health Sciences Universitas Muhammadiyah Yogyakarta in 2018 . The samples were male and female students 20-26 yo. The psychological instruments were optimism test, motivation test, depression test, anxiety test, fighting spirit test and the MMPI test. Data were analysed by using bivariate, univariate and multivariate tests with the application of the SPSS computer program. Results: The results showed that the passing rate of CBT and OSCE reached more than 80% (CBT 82.3%; OSCE 84.9%). Supportive psychological aspects indicate that the students have very high optimism (43.8%), high optimism (35.4%), no depression (54.2%) and mild anxiety (39.6%) The MMPI test showed that students who passed the SCTDPP were those who did not have a mental disorder and only had mild depression and anxiety as well as a moderate level of behaviour and thinking pattern. Conclusion : An optimism is the strongest aspect (r = 0.9, p 0.000) to success of SCTDPP