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A ground simulator of spaceborne measurement and communication system (SMCS) was designed to test and evaluate the interconnection of SMCS on the ground. The simulator consists of transceiver, time frequency unit, channel emulator and management control computer. The transceiver includes two FPGAs, which supports signal transmitting and receiving processing between satellites. Furthermore, it has good consistency in function and performance with spaceborne devices. The channel emulator can real-time simulate signal transmission delay, doppler and the fading characteristics, which significantly enhanced the authenticity of the test and the credibility of evaluation conclusion. The process of interconnection test had showed the simulator had many advantages, such as complete function, reliable performance, simple manipulation and easy handling. The test results effectively verified the feasibility of the interconnection scheme for inter satellite.