The purpose of this study is to establish a multi-center clinical registration platform, to form the real world evidence of New Blood Syndrome Theory intervention in psoriasis, and to evaluate the therapeutic advantages of New Blood Syndrome Theory therapy in the clinical effective and recurrence rate of psoriasis vulgaris.

Psoriasis is a common chronic and recurrent inflammatory skin disease. The incidence of the disease is increasing year by year, seriously affecting people's quality of life. The systematic treatment of psoriasis in modern medicine is limited of wide application due to the adverse reactions of different degrees and the high economic cost.

Chinese Medicine (CM) has unique advantages in treatment of psoriasis. On the basis of CM principle--"Blood Differentiation and Treatment" in psoriasis and the combination of clinical experience, Chinese famous professor Wanzhang Qin proposed the "New Blood Syndrome Theory" in psoriasis--the psoriasis based in blood, with blood heat first, and blood stasis throughout the whole process of psoriasis. This study will form a systematic report on the diagnosis and treatment of psoriasis with the New Blood Syndrome Theory; theoretically verified by prospective cohort studies, a theoretical system of the New Blood Syndrome Theory for psoriasis will be constructed.

Objectives of this study are to establish a multi-center clinical registration platform, to form the real world evidence of New Blood Syndrome Theory intervention in psoriasis, and to evaluate the therapeutic advantages of New Blood Syndrome Theory therapy in the clinical effective and recurrence rate of psoriasis vulgaris.

Inclusion Criteria of psoriatic:

1. In line with the western and Chinese Medicine diagnosis standard of psoriasis vulgaris and Chinese Medicine syndrome diagnosis standard of psoriasis;
2. 18 to 65 years old, male or female patient;
3. The selected subjects cannot be selected or omitted until the pre-designed number of cases is completed;
4. Informed consent must be obtained.

Exclusion Criteria of psoriatic:

1. Patients with a history of serious mental illness or family history;
2. Other reasons that the investigator considered inappropriate to participate in the study.

Inclusion Criteria of health volunteers:

1. Not in line with the western and Chinese Medicine diagnosis standard of psoriasis vulgaris and Chinese Medicine syndrome diagnosis standard of psoriasis;
2. 18 to 65 years old, male or female patient;
3. The selected subjects cannot be selected or omitted until the pre-designed number of cases is completed;
4. Informed consent must be obtained.

Exclusion Criteria of health volunteers:

1. Other active skin diseases which may affect the condition assessment are present;
2. Those with severe, uncontrollable local or systemic acute or chronic infections;
3. Patients with a history of serious mental illness or family history;
4. Other reasons that the investigator considered inappropriate to participate in the study.