The purpose of this study was to analyse the lower extremity stiffness when drop landing by examining the effect of raised heel insole on the flexion angle of lower extremity and the amount of change of moment. Subjects were right footed 11 male(age : 23.64±2.06 yrs, height : 176.00±3.07 cm, weight : 69.09±2.91 kg) college students. In order to gather images and ground reaction force information 8 motion analysis cameras and 1 forceplate was used. The results were as follows. First, with 4cm raised heel insole the change amount of flexion angle of the ankle joint decreased but the change amount of the knee and hip joint showed no difference. Second, with raised heel insole the change amount of ankle moment decreased but the change amount of the knee and hip joint increased. Third, the higher the heel insole the more increase in the knee joint stiffness. The raised heel insole has many negative effects on the body. Because there are gender differences regarding the structure of the anatomy, future studies should examine how the raised heel insole effects the body of men and women respectively.