Abstract: Open Model Interface(OpenMI) has provided an open technology standard for coupling models from variety domains. This paper gives a brief introduction of OpenMI technology. The working principle and key technologies of using the OpenMI for coupling models have been analysed. Then this technology has been used for coupling 1D river net model and 0D polder model with satisfactory simulation results， which verifies that it is effective for coupling models and models′ reuse. Finally， this paper discusses its utility and some problems that need special attention in the application.