A college student, Xiao Zhang, 18 years old, male, suddenly felt that his parents had been replaced by someone else with a similar appearance when he returned home from summer vacation, and other things in the house had also been replaced. He called the police several times and went everywhere to find his biological parents and find the truth of the matter; if a relative explained to him that his parents had not been replaced, the patient immediately suspected that this relative was an accomplice of the impersonator and had also been replaced. Xiao Zhang lives in tension and fear every day, afraid that the impostor will poison him. The patient’s symptoms are called Capgras syndrome, named after the French psychiatrist J. Capgras, who first described it, and is also known as the stand-in syndrome or impostor syndrome. It is mostly seen clinically in schizophrenia. Dr. Ding recommends that this patient must be treated promptly to avoid adverse consequences. This is because such patients are often potentially dangerous people who hurt people and cause trouble. Because such patients often do not feel safe and are afraid that the impersonator will hurt him, they make the first move, and the patient’s suspected impersonator is often a relative of the patient, mostly a parent, who is often negligent in taking precautions against the patient, which can easily lead to serious consequences. It is recommended that they be treated promptly, isolated or hospitalized if necessary, and that parents and relatives be informed of the disease’s It is recommended to provide timely treatment, isolation or hospitalization if necessary, and to inform parents and relatives of the dangers of the disease, to strengthen prevention on the one hand, and to understand the disease and the correct treatment methods on the other hand to reduce discrimination. Treatment is based on antipsychotic medication, and electroconvulsive therapy can be used if there is severe self-injury and suicide, injury and destruction of objects.