In order to realize real-time measurement with high precision and high reliability, we propose a Zemax simulation based energy analysis method of optical system for laser tracking measurement. Based on the principle of optical system for laser tracking measurement, the energy model is established. The influence of non-ideal optical elements on the energy of optical system is analyzed by Zemax simulation. The simulation results show that the best interference pattern is obtained when the interference beam split ratio is 5∶5 and the tracking beam split ratio is 7∶3. In this situation, the interference signals from the four receivers have close energy, and the visibility of fringe pattern reaches 0.89. The visibility of fringe pattern of the four received interference signals will degrade when the reflectivity of polarization beam splitters is under non-ideal conditions. The non-ideal transmittance of the polarization beam splitters does not affect the visibility of fringe pattern. The research is useful for the laser tracking measurement system, mainly in terms of precision improvement, reliability evaluation, optical system design, and optical element selection.