Polarimetric Synthetic Aperture Radar (PolSAR) is a type of microwave imaging radar that avoids the influence of weather, light and clouds, and it has the capability of all-day and all-weather imaging. Therefore, PolSAR images have become one of the main data sources for land classification based on remote sensing image. From the perspective of technical methods, this paper discusses the methods and applications of land classification based on PolSAR image in recent years. It introduces the technical methods and experimental effects, and analyzes the development trend of land classification based on PolSAR image.