The classification of patients with severe mental disorder is based on the risk of disorder, and is divided into 6 levels according to the symptoms of disorder, the occasion, whether the disorder is directed at property or people, and whether the disorder can be stopped by persuasion. level 0 is the absence of any of the behaviors in levels 1-5, level 1 is the patient only has verbal threats or shouting, no vandalism, level 2 is the patient has vandalism, but only in the home, and can be stopped by persuasion. Level 3 means that the patient has obvious vandalism and does not distinguish between occasions, which may be at home or in public, but only against property and cannot be persuaded to stop. The level 5 refers to patients with any violent behavior or arson, explosion, etc., also regardless of the occasion.