The Chinese HY-215 is a new satellite for soil moisture monitoring, although it is the first satellite for dynamic ocean environment monitoring for China. HY-2 is designed for all-weather, all-aerospace ocean information obtained with multiple sensors onboard including the microwave scatterometer, radar altimeter, scanning microwave radiometer (RM), calibration microwave radiometer, etc. As one of the instruments onboard the HY-2 satellite, the RM operates at 6.6, 10.7, 18.7, 23.8, and 37 GHz. Therefore, it is mainly used for observations of sea surface temperature, wind speed, water vapor content, and rainfall rate. Because there are several space-borne microwave RMs with similar frequency configurations that have been launched for Earth observations, the RM sensor can also be used to measure the land surface soil moisture. This will increase the value and impact of the HY-2 satellite mission by introducing broader applications for the scientific community. The produced soil moisture product would provide a unique source of consistent information about land soil at a global scale. In addition, the acquirement of both passive and active observations would contribute to the new combined active–passive soil moisture algorithm development.