Abstract: This paper reviews the development of HRCLDAS, a high-resolution land data assimilation system, focuses on the important progress and breakthroughs in HRCLDAS research and development, and summarizes the contribution of these developments to the HRCLDAS operation. These include the 1 km resolution of meteorological data by using multi-grid variation analysis technique; The ground Radiation product quality and spatial resolution based on the data of 1-km visible channel, highresolution terrain and surface albedo of FY-2 satellite; Simulation of ground solar radiation using hybrid model and ground station sunshine hours, air temperature and other elements; Achieving the integration of the these information by using multiple grid variation analysis technology; Achieving integration of the East Asia satellite precipitation products (EMSIP) and observational data at 40-thousand automatic stations. A parallel calculation scheme combining the block parallel and mode is designed to realize ef ficient soil moisture simulation based on the characteristics of high terrestrial simulation resolution and large data volume. The HRCLDAS did promote all meteorological departments at varous levels to carry out related operation applications