The main purpose of this study was to compare the center of gravity location that get from different segmental parameters and 2D reaction board technique. Eighteen healthy college students who served as subjects in this study (height = 175.1±7.9 cm; weight 75.1±11.0 kg). There different segmental parameters including Clauser, Dempter, Zheng, Song, Zatziorsky & Seluyanov, and Bernseun studies. The result showed the average standard error of three different postures were 4.8±1.3cm, 3.4±1.1cm, 4.3±0.9cm by Clauser; 4.7±1.4cm, 3.4±0.9cm, 4.2±1.1cm by Dempter; 4.2±1.4cm, 4.6±1.2cm, 3.9±1.5cm by Zheng; 5.6±2.3cm, 3.6±1.4cm, 8.0±2.3cm by Song; 7.6±1.5cm, 4.9±2.1cm, 8.1±2.0cm by Zatziorsky & Seluyanov; 3.6±1.7cm, 6.7±1.4cm, 4.0±2.5cm by Bernseun. The value is between 3.4cm to 8.1cm. Therefore, this study provide a method to choose the lower error of segmental parameters before motion analysis.