In order to correct the drift of the UAV strapdown inertial navigation system and realize the construction of UAV integrated navigation system, the information fusion technology of integrated navigation scheme for UAV in approaching stage is studied.Based on the basic concept of Kalman filter method for information fusion, the models of laser range finder, electronic compass and altimeter system used to correct the drift of strapdown inertial navigation system are deduced, and then the model of the aviation information fusion subsystem for UAV integrated navigation is built.A multi-rate Kalman filtering system based on indirect parameter estimation is constructed.The simulation of UAV integrated navigation information fusion system is realized by building a mathematical model with Matlab, and the feasibility of the information fusion scheme is verified.