As　the　critical　component　of　concentrating　photovoltaic　module,　secondary　concentrators　can　be　effective　in　increasing　the　acceptance　angle　and　incident　light,　as　well　as　improving　the　energy　uniformity　of　focal　spots.　This　paper　presents　a　design　of　transmission-type　secondary　microprism　for　dense　array　concentrating　photovoltaic　module.　The　3-D　model　of　this　design　is　established　by　Solidworks　and　important　parameters　such　as　inclination　angle　and　component　height　are　optimized　using　Zemax.　According　to　the　design　and　simulation　results,　several　secondary　microprisms　with　different　parameters　are　fabricated　and　tested　in　combination　with　Fresnel　lens　and　multi-junction　solar　cell.　The　sun-simulator　IV　test　results　show　that　the　combination　has　the　highest　output　power　when　secondary　microprism　height　is　5mm　and　top　facet　side　length　is　7mm.　Compared　with　the　case　without　secondary　microprism,　the　output　power　can　improve　11%　after　the　employment　of　secondary　microprisms,　indicating　the　indispensability　of　secondary　microprisms　in　concentrating　photovoltaic　module.