Upon analyzing the characteristics of laser code and wave gate setting, a new kind scheme of laser code in the laser terminal guidance ammunition round is proposed. Based on analysis it is concluded that the scheme has the advantages of both pulse interval coding and bit-limited random periodic code.It has the characteristics of easily identifying the first signal, and having no fixed pulse repetition or periodicity.The scheme which can easily be decoded by ourselves but not be recognized by enemy, and has the ability of countering active deception jamming.