The operational systems,using modern sophisticated technology with the purpose of monitoring and nowcasting middle scale severe weather events being a main area in meteorology,have been developing vigorously in the world since the late 1970s. In the 1980s, starting from the introduction of an American Digital Weather Radar System to the completion of the Project for《Severe Weather Monitoring and Very-short Range Forecasting System》subjected to the National Program in the 7th Five-years Plan,the Wuhan Central Weather Service had developed and established a modernized Torrential Rains Operational Nowcasting System in the middle reaches of the Changjiang River(MYTRONS). From the view point of system engineering, the author describes the design consideration, technical strategy and systematic structure. The success of MYTRONS signifies the significant progress in the modernization of operational meteorology in China.