The Gao Fen 7 (GF-7) satellite is China's first submeter, high-resolution Earth observation and remote sensing satellite for natural resource monitoring, land surveying, and other industrial applications in China. The GF-7 laser altimeter system is the successor of the ZiYuan3-02 (ZY3-02 satellite) laser altimeter. The key objective of the GF-7 laser altimetry system is to provide high-precision ground elevation control points that assist in optical imaging to achieve 1:10000 mapping in China. This paper introduces the GF-7 laser altimeter system payload specifications, mission objectives, in-orbit calibration plan, data products, and service policy. In the future, the GF-7 laser altimeter system will also serve multidisciplinary and professional applications through its precise elevation measurement capabilities. In addition, it will play a vital role in Earth observation, climate change monitoring, and environmental protection.