Objective : The purpose of this study was to evaluate the Sasang constitution and body composition of the two groups devided by chest PA. Method : This study was carried out on 60 students of Semyung University. The students were selected according to the aspect ratio of rt. lung from chest PA. They were divided into two groups(length group and width group) and administered QSCCII & body composition analysis. Result : The 30 students of the length group were classified as Soumin(15), Soyangin(9), and Taeumin(6). The 30 students of the width group were classified as Taeumin(20), Soyangin(9), and Soumin(1). In the width group, weight, total body water, amount of total body fat, muscles, viceral fat area(VFA), waist hip ratio(WHR), were significantly higher than in the length group. Conclusion : There were significant relationships between the shape of lung and constitution and body composition. These findings indicate that actual organ condition could be expressed in body shape.