At present, multiple military and civilian application platforms have simultaneously deployed communication devices and Global Navigation Satellite System (GNSS) receiving devices. The coexistence and mutual interference issues between communications and navigation systems cannot be ignored. Therefore, this article takes the impact of L-band communication system on Beidou navigation satellite receiving equipment as the starting point, completes the compatibility evaluation and experiment of the two signals, and verifies the impact of L-band communication equipment on Beidou navigation satellite receiving equipment by analyzing the original observation data of Beidou navigation satellite receiving equipment, providing technical reference for improving the anti-interference ability of Beidou receiving equipment and the construction of the next generation Beidou satellite system.