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With the increase of the time synchronization requirements of the system, the IRIG-B code is used more and more in the time system module; in view of the traditional single chip microcomputer and special chip implementation method cannot meet the reliability and portability of the product, the design and implementation of FPGA based on IRIG-B is studied;a new iterative algorithm is presented for converting between BCD codes and binary codes; research on IRIG-B encoding and decoding method based on FPGA design method; through simulation experiments, the results show that the proposed method can correct the time information of IRIG-B format decoding and encoding, and the implementation of FPGA can greatly reduce the use of external chips and circuits, thus greatly improving the reliability and portability of the products.