Abstract: Objective To understand the level of mental health knowledge of community medical staff after the establishment of Medical Treatment Partnership System(MTPS) in C district of Beijing, analyze the training demands of medical staff, and provide decision reference for improving the mental health service ability of community medical staff. Methods A total of 575 community medical staff in 37 communities of C district in Beijing were participated in the questionnaire survey, the descriptive statistical analysis was used to describe the mastery degree of mental health and training demands of community medical staff. The analysis of variance and chi-square test were used to compare the relative variables of different characteristic population, and binary logistic regression model was used to analyze the factors influencing the cognitive differences of community medical staff in providing mental health services in the community. Results The average mental health awareness rate is 87.5%. There are significant differences in the degree of mental health knowledge among the medical staff in different posts(F=8.220, P<0.001), and the scores of the preventive health care workers were the highest(90.1%), the lowest was nurses(83.2%). The 82.8% respondents thought that the training were helpful for them, the demands for training content of community medical staff were different(χ²=185.074, P<0.001). The demands for identification and diagnosis of mental illness knowledge was ranked on the top. The 86.0% respondents believed it is necessary to provide mental health services in community. The work position was the influencing factor of the knowledge on mental health service supply(χ²=10.416, P=0.015). Conclusion In order to further play the role of community in the construction of mental health service system, it is necessary to set up individualized training project for different positions of medical staff in the community, and improve their awareness and ability to provide mental health services through training.