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.　©　2018,　Chinese　Lasers　Press.　All　right　reserved.