Abstract: Although the noise quasi-continuous wave(CW)radar overcomes the transmit leakage,the transmitted waveform after interrupted amplitude modulation no longer preserves the characteristic of continuity in time domain.Thus the noise quasi-CW radar can not take full advantage of noise CW radar.The dual carrier frequencies are applied to noise CW radar for canceling the leakage.In the noise CW radar with the waveform transmitted by dual carrier frequencies,the absolute values of the spectrums after pulse compression-fast Fourier transform(FFT)processing of two leakages modulated by the dual carrier frequencies are equal.So the leakages and the"noise floor" produced by the leakages can be cancelled by subtraction of the absolute values of the spectrums in the two carrier frequencies separated channels.Simulation results are presented to verify that the noise CW radar with dual carrier frequencies has better performance of leakage suppression than noise quasi-CW radar, while preserving the characteristic of the original radar signal.