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—Inter-satellite Link is an important technical support of self-development navigation system in China. CSTDD(Concurrent Spatial Time Division Duplexing) is a system based on phased-array Antenna, providing a feasible way for the implementation of Inter-satellite Link. This system implements the reuse of the entire space by using directional antenna for narrow beam switching, it also realizes two-way communication between satellites by single link half duplex. At the same time, the whole system uses the same frequency point. How to test the performance of the whole inter-satellite link network under the condition of unfinished networking is a technical problem. The purpose of Inter-satellite Link Network Test Technology is to make use of the characteristics of CSTDD, and test the performance of whole network by using a single ground station. The characteristics of CSTDD are described in detail, and the test requirements of inter-satellite link are refined. Furthermore, an inter-satellite test equipment is made up by using a single ground station according to the characteristics of CSTDD. It generates specified number of virtual satellites, forming a network with satellites in space. It realizes the physical link test, the measurement data test, and the communication data test of inter-satellite link, and provides technical support of self-development navigation system in China.