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PURPOSE : The purpose of this study is how the difference in leg lengths affects the initial body changes. After making an artificial leg length difference for normal people, we will measure the tilt of the spine and the torsion of the pelvis in the body. Based on this, we tried to provide the basic data of correction prescription(shoe lift or heel lift) for the difference of leg length. METHOD : This study was conducted to investigate the effects of leg length differences on the body. After measuring the leg length of the subjects, the leg length difference was given using 1cm, 2cm, 3cm, 4cm, 5cm insole. For adaptation to an artificial leg length difference, each height was stepped for 10 minutes, and measurements were made during the last minute of adaptive gait. We used Formetric as a Measuring tools. RESULT : The subjects who participated in this study were 16 male and 15 female adults in the age group of 20, who were in the K age group. The increase in the insole height resulted in a difference in leg length, And the extent to which it is concerned. CONCLUSION： This study used a spinal structure analyzer (Formetric 4D, Diers Inc, Germany) to investigate the effect of general characteristics, BMI, VAS, leg length, and gender insole height on body changes. According to statistical results, the higher the difference of anthropomorphic leg length, the more influence on pelvic torsion and tilt angle, but it did not affect kyphotic angle and lordotic angle.