Synthetic Aperture Radar (SAR) technology has unique advantages in forest resource monitoring due to its all-day,all-weather imaging capability and sensitivity to vertical forest structure information.Therefore,SAR has become a research focus of current forest resources remote sensing survey technology.Firstly,the development background,development trajectory and related knowledge of SAR forest resources monitoring technology are introduced.Then,the technological developments of polarimetric SAR,interferometric SAR,polarimetric SAR interferometry and tomographic SAR in research of forest land cover type classification,change detection and forest parameter quantification estimation are emphasized.Finally,the existing problems and development trends for forest resource monitoring research and application of SAR are summarized and analyzed.