This work combines Kinect-based somatosensory interaction with children's sports games, and uses the Unity3D game engine to design a children's sports somatosensory game. This work is based on actions to improve children's physical fitness and athletic ability, such as running, jumping, and raising hands on the side. In the design of the three levels, the reasonable use of actions to realize the game function, so that players can effectively exercise while entering the game, so as to stimulate children's subjective initiative in physical exercise. Players can choose to use traditional mouse interaction or Kinect-based somatosensory interaction. Multiple functions are implemented in the game, including motion detection, continuous generation of roads, character movement, random appearance of props, and collision detection.