Interrupted sampling repeater jamming (ISRJ) is a radar coherent interference technology based on the principle of undersampling, which processes radar signals at a low sampling rate and uses the matched filtering characteristics of radar signals to obtain pulse compression gain and produce suppression and deception interference. This paper obtains the jamming sampling signal based on the principle of ISRJ, and designs a complementary signal according to the discontinuous sampling characteristics of the jamming signal. Based on the designed complementary signal, the LFM signal is improved to obtain the proposed pulse- LFM signal with anti-jamming ability. The theoretical derivation and simulation results show that the pulse-LFM can effectively suppress ISRJ of different types while maintaining the ambiguity function characteristics of the original LFM signals.