Psoriasis vulgaris is a common and incurable chronic inflammatory skin disease that causes great physical and mental pain to patients. The main clinical manifestation is erythema, papules or patches of skin covered with silvery white scales and varying degrees of itching. Patients with psoriasis are found all over the world, and the disease can develop in different ethnic groups, genders and ages. In China, its incidence rate has been increasing significantly in recent years, rising from 0.12‰ in 1984 to 0.72‰ in recent years. Due to the long course of the disease, it is persistent, easy to recur, affects the beauty, and brings great harm to the physical and mental health of patients, and is called “the undead cancer” by the dermatology department. The World Health Organization has listed “psoriasis” as one of the ten most persistent diseases in the world. At present, it is believed that psoriasis is characterized by epidermal hyperkeratosis, angiodysplasia and inflammatory reaction, and is a stubborn and intractable chronic skin disease with multi-factor participation, multi-genetic changes and multi-stage development. Its pathogenesis is still unclear and may involve various factors such as genetics, immunity, inflammation, cell proliferation and apoptosis, neuromediators, skin barrier, environment, diet, etc. It is currently believed that genetic susceptibility is the main factor in the pathogenesis of the disease, while acquired skin barrier dysfunction plays a triggering or aggravating role in the pathogenesis of psoriasis. The study of the pathogenesis of psoriasis has been the focus of dermatological research. From a clinical epidemiological point of view, there is a specific pattern inherent in the whole process of onset, progression, remission and remission of psoriasis, and the allogeneic constitution is a key factor in the onset or not, but it is also influenced by factors related to environment, emotion, disease, medication, diet and external stimuli. Due to the lack of sufficient knowledge of the disease in most patients, over-treatment by drugs and other means is an important reason for the recurrence and aggravation of the disease. The skin barrier function is damaged, the body’s self-healing function is greatly inhibited, and the recovery of the epidermal barrier function becomes abnormally slow or even further deteriorated. Based on the above, we put forward the viewpoint of psoriasis theory of treatment, using natural Chinese medicine to treat psoriasis with the method of strengthening the spleen, nourishing the blood, moisturizing the skin, treating psoriasis with a long-term, regular, combined internal and external treatment, returning to nature, giving the skin space and time to repair itself, and promoting the recovery of the skin barrier function.