Abstract: Global positioning system/inertial navigation system (GPS/INS) integrated navigation has been widely used in guiding the precision guidance weapons. With the gradual maturity of GPS/INS ultra-tight coupling technology, the anti-jamming capacity of the entire integrated navigation system is improved significantly. In order to effectively implement navigation countermeasures by adopting GPS/INS super-tight coupled precision-guided weapons, divide the jamming power region into disturbed area, half failure area and failure area according to GPS receiver different link’s performance decline indices, and combine the influence of GPS/INS super-tight coupling on the structure design of receiver tracking loop, this paper derives and analyzes the jamming power required at the receiver’s RF front-end when the capture, tracking and demodulation performance of GPS P(Y) code and M code signal down to division critical value under the matching spectrum jamming. Considering the relationship between the direction of arrival (DOA) of jamming and GPS receiver’s antenna gain, the changes of jamming source transmitting power along with effective jamming range about each jamming power region have been simulated and acquired on different blast-off height. Then, the continuous blanket jamming range to precision guidance weapons of adopting GPS/INS ultra-tight coupling has been analyzed quantitatively. Finally, the problem of setting jamming source number and location is modeled and solved. The conclusion achieved can offer a guidance for the practice of limited load and height blast-off platform jamming source implementing navigation countermeasure to precision guidance weapons of adopting GPS/INS ultra-tight coupling.