Abstract: The relation between type A behavior pattern and psoriasis and the influence of behavior pattern on the disease are reported.The study was performed on 50 cases of psoriasis and compared with normal controls.The reaults showed the patients with type A behavior pattern are 11.5 times more than those of type B.It is one of the important factors of psorisais.The authors also discussed the behavior pattern and the change of it in patients with psoriasis.