Realtime nonuniform correction is a key technique for IR imaging. The degree of turning the design into a piece of mold is not high and the speed design study is not enough to make using of FPGA to carry on correcting on the thesises that were announced publicly. After thorough study, a soft pit microprocessor named NIOS II is used to resolve the problem of the mold design. And the speed design is studied thoroughly on the thesis. After turning the design excellently, the mold of nonuniform correction can operate with 111. 51MHz. And it has very great engineering application value.