For the problem that the simple modulated radar signal can be easily intercepted by electronic reconnaissance equipment in modern electronic war,a hybrid radar signal composed of LFM and 7 bit Barker phase coded signal is proposed. By the theoretical deduction and computer simulation, the signal form and characteristic in the time and frequency domain are discussed. The ambiguity function ,time and frequency joint parameter estimation and low probability of intercept features are also studyed. The results show that the hybrid radar signal has good characteristics in time and frequency domain ,high distance and velocity resolution and the improved intercept factor.