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The aim of this study is to show the effect of starting block angle on the starting motion of sprinters using a crouching start. After installing starting blocks on forced platform, and having four highly comparative sprinters use the starting blocks, I analyzed the temporal valuables, segment position, center of mass position, and the enforce amount imposed to the platform at the time of a crouching start. From the results of the analysis, the following conclusions could be drawn:1. Each subject showed the shortest reaction time in each phase when the starting block angle was set as 50-55o. 2. The center of mass displacement was greater when starting block was set as 50-55o. 3. The value of ground reaction force Fy and Fz was greater when the rear starting block angle was set as 50-55o.