Although the importance of determination of the most important mechanical variables and special physical qualities contributing in the level of performance of O-soto-gari skill, the researcher according to his knowledge did not have any study that aimed to determine the most important mechanical variables and special physical qualities contributing in the performance level of O-soto-gari skill which pushed the researcher to conduct this study to know the percentage of contribution of some mechanical variables and special physical qualities in the performance level of the skill under investigation. This research aims to know the percentage of contribution of some mechanical variables and special physical qualities in the performance level of O-soto-gari skill.