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The ultrasonic positioning system based on wireless LAN is an important part of real environment digital games. In this paper, based on the battle system of the model tanks, we design a set of indoor ultrasonic positioning system, to achieve the real-time tracking of the model tanks. Through the special design of wireless control technology, the positioning accuracy of the model tanks can reach the level of decimeter, and it completely satisfies the requirement of positioning accuracy in real environment digital games. Meantime, the ultrasonic positioning system can also be applied to the range-finding, positioning and environmental monitoring of other fields, and it has a wide range of applications.