Coupling　optical　properties　of　parabolic　trough　solar　collector,　Monte　Carlo　light　tracking　method　was　used　to　set　up　optical　system　model　and　carry　out　SolTrace　simulation　analysis　of　the　parabolic　trough　solar　collector　system　which　was　designed　and　built　in　east-west　axis　direction.　The　effective　radiant　energy　flux　and　the　wall　energy　flux　density　distribution　of　parabolic　trough　solar　collector　with　different　time　and　different　direct　solar　irradiance　in　test　day　were　obtained.　The　comparative　analysis　of　the　simulation　data　and　experimental　data　was　carried　out.　The　results　show　that　there　is　better　consistence　between　the　simulation　data　and　experimental　data,　the　minimum　and　maximum　deviation　are　8.1%　and　16.4%,　respectively.　The　experimental　data　verifies　better　the　feasibility　of　SolTrace　simulation　system　and　the　credibility　of　simulation　results.　The　solar　radiation　energy　absorbed　by　parabolic　trough　solar　collector　is　mainly　affected　by　the　incident　angle　of　sunlight　and　solar　irradiance.　The　simulation　results　reflect　effectively　the　optical　and　thermal　properties　of　the　concentrated　solar　thermal　power　generation　system,　and　provide　the　reference　for　the　design,　optimization　and　engineering　application　of　the　concentrated　solar　thermal　power　generation　system.　©　2016,　Editorial　Board　of　Acta　Energiae　Solaris　Sinica.　All　right　reserved.