A wave-front processing algorithm was proposed based on Field Programming Gate Array(FPGA) for improving computational complexity and real-time ability of adaptive optical systems. The reuse of core processing module was used to calculate a wave-front slope, and the decomposition of matrix and vector was used to calculate the wave-front restoration. Under the synchronization of pixel clock, the whole wave front was processed and the momentum required by an actuator was given. A piece of Virtex-4 LX80 FPGA was taken as a main chip to perform experimental verification, and the experiment results show that the algorithm reduces the hardware resources by 50%, and improves wave-front processing ability of the system. Furthermore, all of the wave-front processing operations can be implemented in the current frame before the processing end, which improves processing speeds and control bandwidths of the adaptive optic system. The new algorithm has carried on the correction experiment of the laser light source for a Shack-Hartmann in the room, and it shows a higher concentration ratio of light source.