The technology of the real-time communication between the Galaxy Simulation Workstation (GSW) and the shared-memory real-time network is first researched. Then the application program interface (API) of the real-time communication between them is introduced. And an example of real-time network communication, which is implemented in YHSIM simulation program, is described. Finally, the experimental result is given, which proves this technology can be effectively used for semi-physical simulation of large scale complex systems.