RESUMO
As one of special groups in social groups,vagrant psychiatric patients have uniqueness.There are many ethical issues in their diagnosis and treatment,such as voluntary principles and involuntary medical treatment,protective constraints,patient's privacy protection,personalized treatment,fairness and so on.Therefore,to protect the fights and interests of psychiatric patients,it should strictly follow the standard of involuntary hospitalization and four principles of medical ethics when they are admitted to hospital;it should give protective constraints and make the diagnosis of mental disorder when they exist impulses and negative risks involved themselves or others.Meanwhile,it should give psychological counseling,take minimum limit to patient as principle,develop personalized treatment plan,provide humanity service,pay attention to the protection of privacy rights and promote early recovery of patient.