This paper analyzes the application of bus technology, serial link technology and FPGA (field programmable gate array) principle in protocol conversion. Bus technology can realize efficient data transmission and exchange; serial link technology can meet the needs of low-speed communication between different systems; high flexibility and parallel processing ability of FPGA can improve the efficiency and reliability of protocol conversion. The functional design of integrated circuits supports the conversion and adaptation of multiple protocols. In addition, the basic concept and importance of closed-time iteration are introduced, and then a closed-time iteration strategy suitable for enterprise application interconnection platform is proposed through assumptions and modeling.