Over the last half century,tremendous theoretical results have been achieved in the study of soil reinforcement by root system in various aspects.This paper focuses on the brief description of the relevant theoretical models of soil reinforcement by root system,including Mohr-Coulomb Strength Theory,Reinforced Theory,and Anchorage Theory,as well as major mathematical models covering Side Roots Theoretical Model(W-Model),Vertical Root-soil Interacting Mechanics Model,and Lateral Root-soil Interacting Mechanics Model.In addition,key study fields are analyzed and recommended pertaining to root distribution,friction of root-soil,and root mechanics.