Interrupted-sampling repeater jamming is a typical radar active jamming mode.In order to counter the self-defense interrupted-sampling repeater jammingthe generation mechanism of false targets is analyzed.Based on thisand inspired by time domain correlation and frequency domain correlationan interrupted-sampling repeater jamming suppression algorithm based on fractional order correlation is designed and proposed.The algorithm takes the interfered echo in a coherent processing interval as the processing objectand changes the fast time position distribution of false targets by performing different fractional correlation processing on echoes with different repetition periodsand achieves the purpose of jamming suppression through coherent integration.Simulation results show that the proposed algorithm has certain suppression efficiency for interrupted-sampling repeater jamming.After suppressionthe critical Jamming-to-Signal Ratio (JSR) for effective detection of real targets is increased by about 25 dBand the suppression rate of false targets is more than 50%.