Obsessive-compulsive disorder (OCD) is a neurological disorder in which obsessive-compulsive ideas and actions are the main manifestations. It is characterized by the co-existence of conscious self-compulsion and conscious counter-compulsion. Patients know that the persistence of obsessive-compulsive symptoms is meaningless and irrational, but they cannot restrain their recurrence, and the more they try to resist, the more nervous and painful they feel. If the disease is prolonged, ritualistic movements may be the main manifestation, and although the mental pain is significantly relieved, the social function is seriously impaired. The symptoms may vary from a single symptom to the presence of several symptoms at the same time. The content of the symptoms may be relatively fixed for a period of time, but may change with the passage of time. I. Obsessive-compulsive ideas, i.e., certain associations, ideas, memories or doubts that recur stubbornly and are difficult to control. (a) Obsessive-compulsive association: repeatedly recalling a series of unfortunate events will occur, although knowing that it is impossible, but can not restrain, and provoke emotional tension and fear. (ii) Compulsive recollection: repeatedly recalling irrelevant things that have been done, although knowing that there is no meaning, but cannot be restrained, and must be recalled repeatedly. (c) Compulsive doubts: unnecessary doubts about the correctness of their actions, to verify repeatedly. For example, after leaving the house, I wonder if the doors and windows are really closed, and I go back several times to check. If not, then feel anxious. (iv) Compulsive exhaustion: repeatedly thinking about natural phenomena or events in daily life, knowing that it is meaningless, but cannot restrain it, such as repeatedly thinking: “Why does the house face south but not north.” (e) Forced oppositional thinking: two opposing words or concepts repeatedly appear in the mind one after another, and feel distressed and nervous, such as thinking “pro”, immediately appear “against”; talking about “good people When you think of “good people”, you think of “bad people”, etc. Forced action (a) forced washing: repeatedly washing hands or objects, the mind can not get rid of the “feel dirty”, knowing that the clean, but can not control and must be washed. (b) Obsessive-compulsive examination: usually occurs at the same time as obsessive-compulsive doubts. The patient is not sure about what he knows has been done, and repeatedly checks, such as repeatedly checking locked doors and windows, repeatedly checking written bills, letters or manuscripts, etc. (iii) Compulsive counting: Uncontrollable counting of steps and poles, doing a certain number of actions, or feeling uneasy if you miss something and have to count it up again. (iv) forced ritual action: before the daily activities, first to do a set of actions with a certain procedure, such as bedtime to a certain procedure to take off clothes and shoes and placed according to a fixed rule, otherwise feel uneasy, and re-dress, shoes, and then take off according to the procedure. Third, compulsive intention In a certain situation, the patient appears a thought that he knows is contrary to the situation, but can not control the appearance of this intention, very distressed. For example, when a mother carries her child to the river, the idea of throwing the child into the river suddenly arises, although the corresponding action has not occurred, but the patient is very nervous and fearful. Fourth, compulsive emotions specific performance is mainly compulsive fear. This fear is the fear of losing control of their emotions, such as the fear that they will go crazy, will do things that violate the law or social norms or even harm God, rather than the fear of special objects, situations, etc., as in the case of phobias.