Objective : This study's purpose was to review the clinical studies of Oryeong-San. Method : We searched papers about Oryeong-San using KISS, KTKP, PUBMED, Embase, Science Direct, and the key words "Goreisan", "Goreito", "Wu Ling San", "Oryeongsan", "Poria Five Powder" were used. Papers not matched with inclusion criteria were excluded. Results : Until today, there have been 133 studies on the effects of head diseases, urinary system diseases, edema, and other various effects of Oryeong-San. Of these, 23 studies were classified as clinical research papers. There were 8 cases of head diseases, 5 cases of urinary system diseases, 3 cases of edema, 2 cases of adjuvant, 1 case of Dysmenorrhea, 1 case of Primary Hypertension, 1 case of Primary Insomnia, 1 case of hydrocele, 1 case of side effects causing TINU syndrome. Conclusion : It can be seen that Oryeong-San has established the basis for application to the purpose of head disease(chronic subdural hematoma, hydrocephalus, hearing loss), urinary system disease(stone, urinary tract infection), edema, adjuvant, other hypertension and insomnia. On the other hand, considering one case that causes side effect of TINU syndrome, caution should be exercised when observing the progress of the patient taking the Oryeong-San.