A effective way to transfer a symmetrical spot light to uniformity illumination by using polygon rod integrating lens was proposed. A detail study has been carried out to obtain square and circle uniformillumination by polygon rod lens. In some specific length,lenses have best uniformity performance. Triangle and hexangular lens are good choice for circle illumination. Triangle lens is best in uniformity,and hexangular lens has better light collecting efficiency. The illumination uniformity is affected sensitively by light source position offset from optical axis.