The paper summarized the capabilities, performance, and technical characteristics of the 4 payloads onboard the HY-2A satellite including radar altimeter, microwave scatterometer, scanning microwave radiometer and microwave calibration radiometer. The HY-2A satellite is marked as a significant breakthrough for microwave remote sensing technology of China, a milestone for China's own ocean dynamic environment satellite that plays a crucial role in maritime applications, and a role model for China's future ocean satellite missions.