Build a satellite-like navigation system near the airport to provide navigation guidance services for the aircraft’s approach process. The integrity of the satellite-like navigation system is seriously related to the safety of the aircraft’s approach process. The traditional Receiver Autonomous Integrity Monitoring (RAIM) algorithm is mostly effective in detecting single-satellite faults and false detections when multi-satellites faults occur in the satellite-like navigation system, and it’s difficult to prepare to identify the faulty satellites. Based on the least squares residual method, the local detection calculation of binary satellites is adopted and the correlation analysis calculation between the marked binary satellites and other satellites is combined. Four faulty satellites can be detected and marked. Then through step-by-step back-substitution calculation verification, the faulty stars are finally determined. The detection efficiency has been improved and the probability of missed detection or false detection has been reduced. Through the simulation analysis and verification of the method, it’s possible to effectively conduct preparatory detection for multi-satellite faults.