海洋二号卫星是我国首颗海洋动力环境探测卫星，也是目前国际上唯一一颗可全天候、全天时同步获取全球海面高度、有效波高、海面风场、海面风速、海面温度、大气水汽含量、云中液水含量等多种遥感数据的卫星。海洋二号卫星配置4种主、被动微波遥感载荷，采用全新遥感体制，实现关键部件国产化，具有精密测定轨、电磁兼容、高精度姿态控制等技术特点。海洋二号卫星作为国内首颗综合型微波遥感卫星，其工程实现意义重大。本文从系统组成与功能、研制阶段划分、大型试验验证、在轨测试与应用成果展示几个方面进行了介绍。

HY-2A is China's first ocean dynamic environment satellite, and it is currently the only one satellite which is capable of all-weather, all-day synchronous access to the global sea surface altitude, available wave altitude, sea wind field, sea surface temperature, atmospheric water vapor, cloud liquid water and other remote sensing data. HY-2A satellite equips four kinds of active and passive microwave remote sensing load, adopts a new remote sensing system, realizes the localization of key parts and has certain characteristics of precision orbit determination, electromagnetic compatibility and high precision attitude control. As the first comprehensive type microwave remote sensing satellite, the realization of HY-2A engineering is significant. This paper is introduced about the aspects of system composition and functions, development stage, large-scale test, in-orbit test and application results show.