There are three paternalisms in the “Mental health law”,state paternalism,medical paternalism and family paternalism. They are the cornerstone of the normal development mental health. But they also may be violations of the legitimate rights and interests of patients,even the initiator of evil about the normal citizen’s “Forced mental illness”. Practice shows that,if one of the three forces is too strong and be lack of constraints,it is possible to cause “Forced mental illness” phenomenon. Therefore,“Mental health law” should focus on the three forces and take them into an effective processs,so that they can restrict each other,and arouse positive interactions.