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To add the man's hand movements to immersive virtual reality system can effectively improve the immersive and interactive system. Simple, fast, and low cost technology of virtual hand control and operation contribute to the application of virtual hand. Bone structure model of virtual hand is analyzed, and then control method and process of virtual hand based on Leap Motion is put forward. Taking maintenance training as background, four gesture rules of virtual hand operation are designed. RealizationSflowSand key technologies of virtual hand operation is analyzed. A prototype system based on Unity3D engine is constructed to verified virtual hand by simulation. The results show that the operation of virtual hand based on Leap Motion is simple, interaction is nature, which meet the needs of the virtual reality system interaction.