Abstract: In this paper, for the modern intercept processing method such as cyclic autocorrelation method, the expression of intercept receiver signal processing gain was derived from the perspective of the discrete-time signal processing. The analysis and comparison method of anti-interception performance of radar signals was proposed based on cyclic autocorrelation accumulation factor. First，the value of cyclic autocorrelation accumulation factor U of Linear Frequency Modulation (LFM) signal, two-phase encoded signal and Orthogonal Frequency Division Multiplexing (OFDM) signal was calculated to analyze the anti-interception performance. Then, in order to analyze the anti-interception performance of large time-bandwidth product signals, Linear Frequency Modulation (LFM) signal, two-phase encoded signal and Orthogonal Frequency Division Multiplexing (OFDM) signal were used for simulations in the case of low SNR. The theoretical analysis and simulation results show that the High/Medium pulse repetition frequency OFDM signal has a relatively good anti-interception performance.