In order to explore the slip resistance effect and deformantion features of tree roots in shallow potential landeslide

the researchers made the large complex root-soil direct shear apparatus

which can simulate the shear plane at different depth.Experimental results show that the roots in the soil can improve the shear strength of soil

and the root has the ability to delay the destruction of soil;As the shear plane is down

the root could improve the strength of soil gradually;The soil shear strength is also affected by the distribution of root

the reinforcement of root reaches the summit

when the root plane is vertical to the force direction;The range of root’s deformation mainly focuses on adjacent shear plane;The parallel double root deformation is similar in different shear planes.The root’s deformation is the biggest at current shear plane

and the roots deformation upon the shear plane is bigger than the roots under the shear plane.Upon the current shear plane

the front root’s deformation is less than the back root

and in other shear plane

the front root’s deformation is bigger than the back root.The research is significant to slope protection.It provides experimental evidence for the governance of shallow slope.