Since small differential error of odometer causes noise amplification and pulse calculation error causes small differential of mileage meter, both influence on system accuracy In this paper an integrated navigation method based on fixed distance measurement was proposed, which takes the difference between positions of SINS calculation and dead reckoning of odometer in the fixed mileage range as the measurement value of integrated navigation, and the correction method of odometer was put forward for pulse counting truncation error. The results of the system simulation show that this method can quickly separate sensor error of integrated navigation system, and has higher positioning accuracy This method can be applied in system of vehicle SINS widely.