Speech recognition technology can achieve the man-machine dialogue truly, but it has not been application for Marine Simulator. In this paper, an example of VHF of GMDSS simulator to be given to do a briefly introduce from man-machine interface, menu design and data input, and then implemented it on the Visual Studio 2010 platform. Based on researching the key technology about speech signal and recognition, A speech recognition system developed with Microsoft Speech SDK, and operated VHF simulator by using this system. It is the first time to application speech recognition technology on marine simulator, and achieved a satisfactory results, it has a good reference for the speech technology used in other marine simulator systems.