Abstract: In order to analyze the impact of the transmission of the LRF (laser range finder) optical transmitting system on the ranging performance, the quantitative analytical formula for the transmission of the LRF optical transmitting system was obtained by using the ray tracing equation and partially polarized light theory. The dependence of the transmission of a given optical transmitting system on the polarization parameters of incident laser beam and geometric optical transmitting system is analyzed quantitatively. The results show that the influence of polarization parameters on the transmission characteristics of the transmitter optics is enhanced if incident angle increases, and the energy of laser pulse emitted by LRF changes randomly if the pulse laser emitted by the transmitter is random partiallypolarized light.