Psoriasis, also known as psoriasis, has more treatment options such as medication and photochemotherapy. Therefore, psoriasis does phototherapy, also has a certain role. Psoriasis is a chronic, easily recurring immune skin disease with a certain degree of heredity, which mainly manifests itself as red skin spots, plaques and papules covered with silvery-white scales, which can occur on the trunk, limbs and head, and can cause joint pain, sore throat, nail damage, and so on. Psoriasis is generally not life-threatening and may have a serious impact on quality of life. The purpose of photochemotherapy treatment is to inhibit the immune response and relieve the symptoms of psoriasis by irradiating the plaque area with ultraviolet light. The treatment of psoriasis is mainly based on medication, local topical fluticasone propionate, carbotriol, tacrolimus, salicylic acid, etc., which has the effect of anti-inflammation, helping to normalize the function of skin cells and inhibiting the proliferation of skin cells. If necessary, with oral cyclosporine, methotrexate, avitamin A, can inhibit cell proliferation, there are anti-inflammatory effects. Psoriasis can also take biological agents such as adalimumab, etanercept, infliximab, etc., which have better efficacy. Psoriasis, it is recommended to go to the hospital in a timely manner to receive standardized professional diagnosis and treatment, the drug should be used in accordance with medical advice.