Severe mental illness is characterized by long course and high recurrence rate， which brings huge burden to the society and the family. Case management is a personalized rehabilitation model with multidisciplinary team leadership， which can effectively reduce the symptoms of patients with severe mental illness， reduce recurrence， and improve social function. This paper summarizes the core concept， service mode， clinical efficacy and development status of several case management service modes， and puts forward some constructive suggestions according to the current situation of mental health service in China.