Objective : The purpose of this case study is to report the effectiveness of Sojongyuryang-tang gagambang in respect of spleen dampness on 3 psoriasis patients who had unhealthy dietary habit. Methods : PASI(psoriasis area and severity) score was used to check the prognosis of 3 psoriasis patients, who have been treated with Sojongyuryang-tang gagambang and acupuncture. Results : PASI score decreased as a result of Sojongyuryang-tang gagambang treatment in 3 psoriasis patients. Conclusion : Sojongyuryang-tang gagambang can be effective treatment for the unhealthy diet related psoriasis when diagnosed as spleen dampness.