Low　tracking　accuracy　of　tracker,　wind　induced　vibration　of　structure　and　lens　deformation　by　temperature　lead　to　non-vertical　incident　irradiation　to　the　Fresnel　lens,　which　necessitates　a　secondary　concentrator　in　actual　engineering　application　of　concentrating　photovoltaic　module.　This　paper　adds　a　secondary　focusable　microprism　between　Fresnel　lens　and　solar　cells　in　order　to　improve　optical　efficiency.　The　3D　model　of　microprism　is　established　by　SOLIDWORDS　and　main　parameters　are　optimized　using　ZEMAX.　Results　show　that　combination　of　Fresnel　lens　and　focusable　microprism　achieves　a　higher　energy　when　the　secondary　microprism　upper　spherical　diameter　is　18mm,　the　opposite　side　face　included　angle　is　116　degrees,　and　the　side　length　of　the　bottom　is　2.15mm.　The　highest　energy　of　solar　cell　surface　can　reach　2.4998W,　improving　33.2%,　and　the　module　height　with　the　secondary　microprism　is　88mm,　which　reduces　by　5.5mm　without　secondary　microprism.　Experimental　results　show　that　the　optical　efficiency　of　400X　concentrating　module　system　is　88.67%,　the　acceptance　angle　is　+/-　1.2　degrees,　the　400X　module　maximum　output　power　is　144.7W.