Serve is one of the six basic skills of volleyball. It shows a close, positive and constructive performance. It also is not infulenced by other skills or disturbance among the own team or from the other team. It is the key to getting scores. This study, based on mechanics and through analyzing the skills and mode of mechanics of serve, tries to build the modes of analyzing beach volleyball jump serve on single foot and both feet. as a proof of skill investigation and evaluation. I will make a comparison between them. At the same time, I also want to make an effective control of the quality of each movement and to get the digitaling data of invisible small movement. One CG9906 video camera with a speed of 30 frames per second, 60 fields was used to record the volleyball jump serve on single foot by a male volleyball player, DAVID YANG (a student in NATIONAL HUALIEN TEACHERS COLLEGE). After analyzing the film, eleven joint articulations in the body was taken. PEAK PERFORMANCE film analysis system was used to digitalize the data. The results are listed following: ぇ During the apporach: 1.single foot: the distance of apporach is 3.75m. The second stride length is longer than the first one but shorter than the last one. The first stride length is 0.73m, the second one is 1.37m, and the last one is 1.65m. 2.both feet: the distance of apporach is 3.16m. The second stride length is longer than the first one but shorter than the last one. The first stride length is 0.55m, the second one is 1.02m, and the last one is 1.59m. え During the crouch: 1.single foot: the angular measure of crouch is 32.4. The horizontal displacement of body center gravity is 0.817m; the vertical displacement of body center gravity is 0.592m; the hitting height is 3.032m. 2.both feet: the angular measure of crouch is 68.5. The horizontal displacement of body center gravity is 0.542m; the vertical displacement of body centergravity is 0.744m; the hitting height is 3.184m. ぉ During the hitting: 1.single foot: the horizontal displacement from the hitting point to the ground is 0.333m; the horizontal distance from the hitting point to the end line is 0.527m and to the net is 8.473m. 2.both feet: the horizontal displacement from the hitting point to the ground is 0.218m; the horizontal distance from the hitting point to the end line is 0.382m and to the net is 8.618m.