The Regional High-Precision Simulation System stands as a pivotal software component within the Earth System Numerical Simulation Facility. It encompasses a comprehensive suite of softwares, which include a regional cloud-resolving weather forecasting sub-system, a regional high-resolution air pollution modeling sub-system, a drought modeling sub-system for grain crops in major agricultural regions, and a regional high-precision long-term climate change risk modeling sub-system. These softwares are specifically designed to address critical environmental challenges in China, focusing on areas such as weather forecasting, air pollution prediction and warning, agricultural drought prediction, and climate risk assessment. With a resolution of 3 kilometers for China and 1 kilometer for key regions, the Regional High-Precision Simulation System is competent for simulating and forecasting weather disasters such as typhoons, heavy rain, tornadoes, hail, as well as atmospheric pollutants such as PM2.5 and ozone.