Abstract: ‍ ‍Radar-embedded communication （REC） system is a kind of covert communication method to hide communication information in radar echo signal. However， due to the extremely complex electromagnetic environment of radar system， the radar embedded communication system will be interfered by other communication systems in the same frequency， and eventually the receiver can not accurately identify the echo signal. In order to avoid the interference of complex environment and maintain good covert communication performance， this paper proposes a radar-embedded communication waveform design based on multi-stopband constraint. Firstly， according to the random radar waveform and ideal power density， the objective function is established by power spectrum matching method. Then the quasi Newton optimization algorithm is used to solve the objective function to get the multi-stopband waveform， so as to avoid the same frequency interference problem caused by other communication systems. Finally， based on multi-stopband constraint， an improved weighted combination method （IWC） is used to design the communication waveform. The simulation results show that the proposed method can guarantee low signal error rate （SER） and low probability of intercept （LPI） of radar communication.