In view of the suppression of transmitting deceptive jamming in radar countermeasure, this paper proposes a discrimination and suppression arithmetic based on time-frequency analysis and fisher clustering. Through STFT conversion, the paper analyzes and extracts the time-frequency characteristic of mixed signals by the arithmetic, and then distinguishes the jamming via fisher clustering. Finally, the arithmetic restrains the false targets through time-frequency filtering. The simulation results show that the arithmetic can restrain the deception jamming with frequency shift effectively. When the jamming and the echo are in different unites, the jamming can be filtered directly in any jam-to-signal ratio (JSR), and the interference can be suppressed whose JSR is under 25dB.