The purpose is to analyse the needs and status of family functions of adolescent psychiatric patients.In this paper，from the perspective of improving the family function of the patients，the practical experience and reflection of community rehabilitation of adolescent mental illness is put forward.The study found that through the activities of the family support group，the frequency of interaction among family members of adolescent patients increased and the content of communication was richer；The stigma of adolescent patient is reduced，and self-identity is enhanced；Patient family education resources are supplemented，adolescent patients gain more knowledge and experience；Enhanced peer support for patients' families and new ways to improve the social function of adolescent patients.In addition，community rehabilitation for adolescent psychiatric patients requires the participation of multiple departments，such as family，educational institutions，health services，rehabilitation services，mental health service associations and community rehabilitation centres，they also need a professional rehabilitation concept for adolescent growth stages and policy support from relevant government departments to jointly build a three-dimensional support network for adolescent mental illness community rehabilitation that can improve the family function of adolescent psychiatric patients.