Depressed patients can develop thought disorder, and thought disorder is the core symptom of depressed patients. The main manifestation is slow thinking, specifically the patient’s thinking association speed is significantly slowed down, seems to be more reactive, thinking can not be opened, some patients in thinking about the problem is difficult, always say “the brain is like a rusty machine, like a layer of paste,” the ability to make decisions is significantly reduced, in the decision of major things The ability to make decisions on important matters is significantly reduced, and the person is indecisive and indecisive, and cannot make effective decisions even on small matters. Clinically, it is also found that patients with delayed thinking have less speech, lower voice, slower speech, less volume, and even have difficulties in communicating with others, so patients sometimes appear to live alone behind closed doors, unwilling to communicate with others, and have low self-esteem. Therefore, as a very important core symptom of depression, delayed thinking should be paid special attention and treated early with standardized systematic treatment.