This study was focused on a certain clinical symptom, which could applicated by Pyeongwi-san, and the radical treatment. Pyeongwi-san is applicable to dampness retention in the spleen and stomach, accompanied by abdominal fullness, anorexia, nausea and regurgitation. Main action of Pyeongwi-san is to dry dampness, invigorate the spleen, promote the flow of gi, and regulate the stomach. The herbal remedy drying dampness like Pyeongwi-san however, is just indicatio symptomatica therefore radical treatment must be used together. Jeunginmaegchi, a medical book written by Gyeong-Myeong Jin, who was lived in Myeong dynasty. This book contains many clinical applicable symptoms and constituents derived from Pyeongwi-san. The herbal prescriptions composing Pyeongwi-san is composed of Changchul, Hubak, Jinpi, Gamcho. The major action of these herbs is drying dampness. Therefore, it shoud be seriously consider that curative therapy must eliminate the cause of endogenous dampness.