Floating photovoltaic platforms， recognized as the most promising technological development direction in the industry， have advantages such as wide application scenarios and low environmental pollution. Their development is of great significance for the development and utilization of offshore solar energy. However， the research on floating photovoltaic platforms in China started relatively late and is still in the empirical stage. As a positioning system for floating photovoltaic platforms， mooring systems can ensure stable operation under extreme sea conditions. Therefore， the design and selection analysis of mooring systems have important research value. This article compares the scattering mooring and group mooring forms of a floating photovoltaic platform in the waters of China， and explores the motion response characteristics and mooring line tension characteristics of different mooring forms of photovoltaic platforms under extreme sea conditions. The research results can provide reference for the reasonable selection and design of photovoltaic platform mooring systems.