The design and implementation of the Tianjin mesoscale numerical weather prediction system is to fulfill the requirements of mesoscale numerical weather prediction operation at provincial level meteorological offices. The Tianjin mesoscale numerical weather prediction system is composed of the highperformance computer system, the mesoscale numerical weather prediction model, and the operational working procedure. Its design and implementation involve the construction of the highperformance computer system, the design of the operational transfer of mesoscale numerical model data, and the system monitoring process. The system implementation includes the selection, design and installation of the highperformance computer system, as well as the operational data flow of the mesoscale numerical model and the deployment of the system monitoring process. The Tianjin mesoscale numerical weather prediction system has accomplished the weather forecasting service task for Olympic Games, which has been put into operation.