Abstract: A compound signal composed of linear frequency modulation(LFM) and binary phase-coded(BC) signal for low probability intercept(LPI) radar is given in this paper. This compound signal has the advantages of LFM&BC and can make up their deficiency, The signal-noise ratio will be greatly improved by small time-width and frequency-width. Theoretical analysis and simulation for the characterstics, and pulse-compound process of the signal are given.