|Purpose：We have investigated to analysis biomechanics for pinch strength due to elbow flexion degree. Methods：Pinch strength was measured by Electro Dynamometer(G-100) using four elbow flexion degree (0°, 45°, 90°, 135°). Results：In experimental results, we found that pinch strengths were 5.4kg(0°), 4.8kg(45°), 5.6kg(90°) and 5.2kg(135°), respectively. The Pinch strengths got maximum at 90°degree, minimum at 45°degree. We have calculated F1 values using Σ T-0. As a result F1 values were 540N(0°), 480N(45°), 560N(90°) and 520N(135°), respectively. F1 values got maximum at 90° degree, minimum at 45° degree. Data curve line of F1 values was increased in 45~90 section and decreased in 0~45, 90~135 sections, respectively. Conclusion：F1 (Flexor digitorum superficialis and profundus) values were 10 times bigger than pinch strengths. Data curve line of F1 values was similar to active length-tension curve in 45~90, 90~135 sections.