As the first link of precipitation redistribution, the interception of canopy interception changes the total amount and spatial distribution of precipitation reaching the ground, which is of great significance to the hydrological process and ecological process of the basin. This review expounds the significance of the canopy interception, canopy intercept main research methods and calculation model, and deeply analyzes the precipitation in the canopy movement of the microscopic physical process of the rain on the blade attachment, bounce, splash phenomenon mechanism rule, discusses the existing problems of canopy interception calculation method and the future research.