Abstract: The benchmark of navigation information output by Ground-Based Augmentation System (GBAS) and instrument landing system(ILS) is different. If the data fusion technology is to be used to realize the combination and sharing of the two, the first problem is to align the different navigation information in space. The deviation indication methods of GBAS and ILS are studied and the spatial alignment algorithms of GBAS and ILS are deduced in detail. The X-Plane flight data interaction and analysis system is developed, and the system is used to collect flight data from X-Plane to simulate and verify the given space alignment algorithm. As show in the simulation results, the navigation information of GBAS and ILS can be effectively converted to the unified reference by the proposed space alignment algorithm. Theoretical support for the data fusion research of GBAS and ILS is provided.