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In order to adapt to the increasingly complex electromagnetic countermeasures environment, an optimized correlation interferometer direction finding algorithm architecture is proposed and designed on FPGA in order to calculate the phase difference more quickly and stably. The architecture and operation flow of FPGA direction finding system are given in detail, and a stable and economical system architecture is adopted in combination with practice. In order to meet the requirements of subsequent practical applications, Xilinx's xc7vx690tffg1927-2 board level test for the carrier board of the logic control unit verifies the stability and efficiency of the recognition results of correlation interferometer direction finding by FPGA. After verification, it is found that compared with the traditional FPGA correlation interferometer direction finding architecture, After experimental test, the proposed architecture can reduce the resource occupancy of LUT by 39.5%, increase the direction finding speed by 17%, process signal bandwidth of 80MHz, and jump speed of up to 1200 hops /s.