A satellite navigation signal regional monitoring system based on BDS short message is designed, which can realize the continuous all-weather monitoring of the satellite navigation system in the designated area. In view of the limited reliability and communication capacity of Beidou short message, a multi-card adaptive sending method with feedback retransmission mechanism is proposed, which can obviously improve the sending efficiency and reliability. A multi-station joint interference source intersection location algorithm is studied and a navigation signal area integrity monitoring method is designed, which can locate the interference source and timely alarm when abnormal, which has strong practical value.