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This paper gave a research on approach in the low visibility conditions, making full use of Global Navigation Satellite System which was autonomously controlled by our country to help the airports without updating the ground-based radio navigation equipment from Instrument Landing System Category I to Category II of the same on analogous operational standards. According to analyze the flight data of an airline, in order to improve the accuracy of the aircraft approach and the use of space zones, It introduced the model of differential Global Navigation Satellite System (GNSS) integrating with Instrument Landing System (ILS), to be considered as GILS (GNSS and ILS) approach system. It will employ the extended adaptive fusion algorithm to combine the location data of this two kinds of navigation source. It will simulate the approach path by mathematical modeling. Both the simulation and the actual flight data show this scheme can effectively improve the aircraft’s lateral navigation accuracy and the use of space zones and also has the potential to promote CAT I to CAT II.