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The paper presents an implementing framework of transaction-based HW/SW(hardware/software) co-simulation. The framework partitions a process of transaction-based co-simulation into 4 function lays, and can be used by a co-simulation system. The hw/sw cosimulation of a packet switch module is implemented on the "CD6501 SoC SW/HW co-verification system" of University of Electronic Science and Technology of China (UESTC). The case study has demonstrated that the proposed architecture can readily perform the task of simulation, reduces co-simulation complexities and enhances the verification speed.