Instrument landing system is the key equipment for aircraft approach and landing, and its signal quality directly affects the safe operation level of civil aviation. In order to ensure its continuous normal operation, it shall be subject to regular flight verification every six months according to civil aviation regulations. With the continuous increase of the number of equipment, it has brought great difficulties to verify the transportation capacity and flight support rate. On the other hand, the field signal test means of the equipment operation unit are constantly enriched, which effectively complements the daily monitoring of the space navigation signal of the instrument landing system. Therefore, CAAC can make a pilot attempt, reasonably set the calibration cycle according to the equipment operation status, and start to promote the application when it is mature