The main clinical manifestations of encephalitis are mental disorders, and most patients with encephalitis will have abnormal mental behavior. The treatment of patients with encephalitis who have abnormal mental behavior includes the following: 1. Etiological treatment: The cause of encephalitis needs to be found, and then the cause should be treated, and clinically prone to mental disorders, such as viral encephalitis and immune encephalitis. The patient’s psychiatric symptoms will be controlled as the encephalitis improves. 2. Symptomatic treatment: The patient’s psychiatric symptoms are manifested as irritability, and the condition needs to be treated with suitable antipsychotic drugs according to the degree of psychiatric symptoms. It is customary to use symptomatic drugs such as olanzapine, quetiapine, haloperidol and chlorpromazine to control acute psychiatric symptoms in patients with encephalitis.