For less training const, efficient operation and verification of marine engine room automation System. A novel real and simulation converter system has been designed, which consists of real control and operating consoles with hardware controllers and marine engine room simulation system. In this paper, the system configurations are reviewed and applied to the liquefied natural gas ship (LNGS). The detailed mathematic models of LNGS propulsion system have been established, then the simulation models with computer programming language have been presented. Now this system has been used in real LNGS control and simulation training.