The requirements of precision guidance characteristics of a semi-active laser-guided weapon on the laser-coded pulse interval ΔTi were analyzed herein based on the pulse interval coding method. The generation principles of( the linear-feedback shift register) (LFSR) modulation code and the LFSR status code were studied and simulated. The guidance and anti-interference performances were studied based on the value range and generation method of the pulse interval ΔTi of two codes. This study reports that the LFSR modulation code is not conducive to accurate guidance and is susceptible to accurate frequency code interference with a minimum pulse interval ΔTmin. The LFSR status code overcomes the problem of poor precision guidance characteristics of the LFSR modulation code, and of being susceptible to accurate frequency code interference with the ΔTmin period; however, the problems that the required identification parameters are few and the anti-interference is not strong still remain. This study uses a matrix to complete the register state transition, instead of the LFSR and the function of the modulo-2 adder, based on finding the coding with a high guidance performance and a strong anti-interference performance. A pseudo-random code based on the matrix remainder is proposed and applied. The theoretical analysis shows that the anti-interference performance of the pseudo-random code is better than that of the LFSR status code.