Abstract: The external and domestic development status of Multi-sensor information fusion technique in integrated navigation systems is discussed. Especially, the fusion architecture and methods for INS/GPS/TAN/SMN (Inertial Navigation System, Global Positioning System, Terrain Aided Navigation, Scene Matching Navigation) Integrated Navigation Systems are introduced and investigated deeply. The fusion architecture of INS/GPS/TAN/SMN Integrated Navigation system is put forward firstly; also the idea and method of multi-image fusion are adopted to integrated navigation systems. Artificial intelligence based methods such as fuzzy logic, wavelet analysis and neural network, as well as the combination of these new methods and the traditional stochastic methods are considered as the most prospective methods in this field.