For the problems that secondary concentrators structure is complex, process is difficult, and cost is high, considering the actual engineering application, design of secondary microprism for dense matrix type concentrating photovoltaic module was presented. The 3-D model of this design was established by Solidworks and important parameters such as inclination angle and component height get optimized using Zemax. The results show that the combination has the highest energy when secondary microprisms height is 5 mm, upper side lengths is 7 mm and working face inclination is 67.38°. The energy of solar cell surface can reach 2.466 9 W, increasing by 31% compared with that of without secondary microprisms. It shows that the secondary microprism is very important in dense matrix type concentrating photovoltaic module.