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In order to study about traffic police gesture's recognition in computer aided driving system, a laboratory system is built to simulate on virtual traffic scene. The device Kinect produced by Microsoft is used to gather the body skeleton data, then features are extracted through experience mode, pattern recognition of traffic police gesture's is used for signal classification, a software Unity 3D produced by Unity is used to realize three-dimensional reconstruction of the virtual traffic scene. The system test shows that using Kinect to recognize gesture can get quickly response and high accuracy rate, and using unity 3D as development platform to realize virtual traffic scene can be convenient and efficient, the combination of both are very suitable for building the computer aided driving system based on visual simulation environment.