In order to deal with the increasingly severe battlefield electromagnetic interference environment, the airborne BDS/INS ultra-tight integrated navigation system's anti-interference performance indicators is analyzed. Firstly, the technical mechanism of BDS/INS ultra-tight combination anti-jamming is introduced. Then the error formulas of the PLL tracking loop of satellite navigation system and ultra-tight integrated navigation system are deduced in detail, and the corresponding theoretical formulas are simulated and analyzed. Finally, based on the inertial/satellite integrated navigation signal software simulator, the anti-jamming performance of the airborne BDS/INS ultra-tight integrated system is simulated. The results show that the BDS/INS ultra-tight integrated navigation system can improve the ability of suppressing interference about 9 dB under typical airborne dynamic conditions. The BDS/INS ultra-tight integrated navigation system has good anti-jamming performance improvement effect, and the result provides certain theoretical reference value for the later development of airborne inertial/satellite integrated navigation equipment.