This paper presents an educational support system of physical motion with body motion based on three-dimensional biomechanism evaluation. The difficult point of the physical motion with body motion is that human cannot attain the perfect copy or imitation of the reference skill motion because each skeleton size, functions and numbers of motor of human are different, we call it the imperfect imitation problem. The proposed system uses a human motion capture which observes and records the movement of human in real time, and extract a 3D (three dimensional) skeleton model from the observed movement data. So, our system is to support the judgment of the expert instructors. In our experiment to evaluate the effectiveness of the proposed system, some education of sports, such as crawl motion in swimming, darts throw motion, Karate defend motion are adopted. And, we certainly will show the useful results.