The purpose of psoriasis treatment is to control the disease, slow down the process of development to the whole body, reduce symptoms such as erythema, scaling and local patch thickening, stabilize the disease, avoid recurrence, try to avoid side effects and improve the quality of life of patients. Communication with patients and evaluation of their conditions during treatment is an important part of treatment. When the effect of single therapy is not obvious in patients with moderate or severe psoriasis, combined, rotating or sequential therapy should be given. The following treatment principles should be followed: 1. Formal: Emphasize the use of currently accepted therapeutic drugs and methods in the dermatological sciences. 2, safety: all kinds of treatment methods should be to ensure the safety of patients as the first priority, not to pursue the recent efficacy of serious adverse reactions. Patients should not be made to apply methods that are harmful to their health for a long time without the guidance of a doctor. 3.Individualization: When choosing a treatment plan, the condition, needs, tolerance, affordability, previous treatment history and adverse reactions of drugs of psoriasis patients should be considered comprehensively and reasonably. The treatment plan for each type of psoriasis: 1. Mild psoriasis: external drug treatment is the main treatment, phototherapy can be considered, and internal drug treatment when necessary, but possible adverse drug reactions must be considered. 2, moderate to severe psoriasis: ultraviolet light, photochemotherapy, methotrexate, cyclosporine, retinoids, biological agents, combined therapy. 3.Pustular psoriasis: retinoic acid, methotrexate, cyclosporine, phototherapy/photochemotherapy, biological agents, supportive therapy, combined therapy. 4.Erythrodermic psoriasis: vitamin A, cyclosporine, methotrexate, biologic agents, supportive therapy, combined therapy. 5.Arthritic psoriasis: NSAIDs, methotrexate, cyclosporine, azathioprine, salazosulfapyridine, biologics, supportive therapy, combination therapy.