Objective To analyze the effects of case management on social function and employment rate of patients with severe mental disorders in community. Methods A total of 45 patients with severe mental disorders met the criteria in Nanlang town where community case management were provided were recruited in the case management group. According to the matching principle of economy and population， another 45 patients with severe mental disorders in Minzhong town were selected into basic management group. Patients of the case management group received community case management， and the patients of the basic management group received basic management services provided by the government. The patients of two groups had been followed up for two years. The Clinical General Impression scale（ CGI） and the Individual and Social Performance scale（ PSP） were used to assess patients at the time of admission， the second year and the third year， and the annual number of employed persons was also counted. Results The repeated-measurement analysis of variance showed statistical significance in the differences of the CGI-SI intergroup main effect and time main effect（ F=7.65，10.99； P ＜ 0.01）. The differences among group main effect， time main effect and interaction effect were statistically significant in the scores of PSP（ F=16.82，10.00，13.74；P＜ 0.01）. There was no statistical difference in the scores of CGI-SI， PSP and the employment rate between two groups on admission， and in PSP on the second year（ F=8.85，P=0.004）. There were significant difference in the scores of CGI-SI，CGI-GI，PSP and the employment rate between two groups in the third year（ F=21.53，26.69，31.91，6.61，P ＜ 0.01；χ2=6.61， P＜ 0.01）. Conclusions Case management can improve the conditions of patients with severe mental disorders in community， enhance social function and improve the employment rate.