Radiosity is a widely used technique for global illumination,which makes a direct impact on the illumination rendering efficiency and realism in the indoor scene.The traditional radiosity requires huge computation. Although the improved progressive refinement radiosity can instantly calculate the form factor, the whole process is still very timeconsuming when the number of patches is large.For the above reasons, the progressive refinement radiosity based on GPU hardware acceleration is proposed,which takes advantage of the parallel computing capabilities of GPU. The judgment of patch visibility and the calculation of form factor are completely achieved in the GPU .The calculation of form factor and the solution of patch radiosity are accomplished in the fragment shader. The application create the frame buffer object, which can carry out the off screen rendering and render to texture. This improved method can reach the speed of interaction for a simple scene, and it will greatly enhance the calculation speed and improve the illumination rendering effect for a complex scene.