Abstract: precomputed radiance transfer is an important aspect to improve the reality of scenes.In this paper，it analyzes the algorithm of precomputed the radiance transfer and points out a real-time rendering algorithm of static scene based on precomputed radiance transfer.Use spherical harmonics to project the incident lighting and radiance transfer，then the exit radiance is the product of the resulting vertexes’coefficients，considering the shadows and interreflections simultaneously.Experimental results demonstrate that the algorithm approaches accurately with high quality and have some utility.