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The application of RF hardware-in-the-loop in simulation demonstration system brings the need for the interactions between RF hardware-in-the-loop devices and mathematical simulation platform and other hardware-in-the-loop devices. To resolve the issue of the mutual usage of software and hardware simulation test data, a hardware system for the test data conversion for RF hardware-in-the-loop was designed . The conversion between the high frequency signal and digital simulation system can be accomplished by RF signal generator,data playback equipment,data acquisition and processing equipment,DA conversion module,high speed digital I/O module and software module of test data conversion in heterogeneous network environment. The hardware architecture and implementation of each module of the system are introduced in detail,and test results are presented,which proves the system can be used to achieve the interaction between the RF and the mathematical simulation system.