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Although the low-cost and low-precision miniature inertial measurement unit (MIMU), fully autonomous transmission of location information, but with the accumulation of time, the error will be larger, that is only able to maintain high accuracy in a short time. There are some defects such as indoor cannot provide continuous positioning signal for the global positioning system. Therefore, the combination of GPS and inertial navigation, then add a wireless positioning system (WPS) to form a seamless navigation mode. According to the location of different scenes, designing corresponding solutions, and using WPS/GPS/MIMU combination, in order to achieve seamless positioning requirements. Finally designs a trajectory generator and a Kalman filter based on the error coefficient. When GPS is instability, the simulation for the Seamless positioning system shows that, comparing to the traditional positioning methods, this method increases the scope of positioning, achieves the seamless positioning requirements.