Abstract: This paper presents an implementation method of digital protection algorithms based on FPGA.The implementation of protection algorithms is accomplished by FPGA instead of MCU.ASIC chip of digital protection algorithm can be made based on FPGA.Simulation result shows that merely several(microseconds) are required for accomplishing the work of full-cycly Fourier filtering or least-square filtering in case of 40 sampling points per cycle.So the processing speed of the system is much faster than that of the system based on MCU and the conflict between action precision and speed can be overcome effectively.