Abstract: Digital audio watermarking is an effective method to protect information security, realize anti-counterfeiting traceability, and copyright protection. The multi-echo kernel hiding algorithm has strong information hiding ability and good imperceptibility. However, the problem brought by the increase of the number of backward echoes is that the interference between the backward echoes is large, which leads to the increase of bit error rate and the decrease of system robustness. This paper presents a forward-backward multi-echo kernel hiding algorithm. The forward echo is introduced based on the multi-echo kernel hiding algorithm, and the amplitude of the forward echo in the cepstrum is enhanced to reduce bit error rate and improve the robustness of the system. The results show that the bit error rate of the proposed improved algorithm is 22% lower than that of the multi-echo kernel hiding algorithm, and it has better robust performance and imperceptibility