Objective Guardianship APP intervention was conducted for the guardians of severe mental disorders in Huicheng,Xinhui district,Jiangmen city and the effect of intervention was evaluated. Methods 1 488 psychiatric patients in the unit area were taken as the research objects,which were randomly divided into the guardian APP installation group of 1084 cases and the non - installation group of 404 cases. The installation group uses guardian APP to realize the dynamic guardianship and real-time monitoring of the patients,and we provided free charge consultation,psychological intervention,medication guide,case tracking and follow-up management services. The non installation group adopted the routine rehabilitation management measures after discharge. After a year the implementation of rehabilitation measures,compliance,condition and social improvement,relapse rate of hospitalization,accident rate and knowledge of family disease between the two groups of patients were compared and analyzed. Results The compliance and rehabilitation measures of the patients in the App group were higher than those in the non installation group. The rate of knowledge about mental illness was higher in family members,and the improvement of SCL-90 score and psychosocial function assessment score after intervention was better than that of non installation group. The rate of relapse hospitalization and cause trouble were lower. The differences above were statistically significant. Conclusion The guardian APP platform helps doctors and guardians to make the monitoring work of patients with severe mental disorder really practical,and the rehabilitation effect is better than the traditional rehabilitation method,which is worthy of further promotion and application.