OFDM signal is one of the commonly used transmitting waveforms in integrated radar communication system.This paper analyzes and compares the characteristics of two kinds of OFDM signals of different sequences(ZC sequence and Oppermann sequence),and analyzes and compares the performance of the two waveforms from the perspectives of autocorrelation,Peak-to-Average Ratio (PAR),ambiguity function and Doppler tolerance.Theoretical analysis and simulation experiments show that the signals of ZC sequence and Oppermann sequence both show concentrated main lobe in autocorrelation function,but the side lobe of ZC sequence is higher than that of Oppermann sequence in autocorrelation function.The PAR of ZC sequence is better than that of Oppermann sequence.ZC-OFDM signal and Oppermann-OFDM signal have the same “oblique blade” ambiguity function.The Doppler tolerance of ZC-OFDM signal is better than that of Oppermann-OFDM signal.In conclusion,ZC-OFDM signal has better radar detection performance than Oppermann-OFDM signal.