Geocell is a kind of three-dimensional net support system designed to improve the capability of soil by lateral restrains. It is generally used as superficial reinforcing material to support slope that restricts its application. On the basis of its characteristic, a new reinforcement model of geocell with anti-slide pile is put forward. The reinforcement mechanism of model is analyzed in whose practice areas include lateral restrains, board effect, and horizontal friction, anti-pull and Anti-shearing. Then, the geocell reinforced mat can be simplified to be a kind of elastic board. The calculation model of geocell with anti-slide pile is built for solution and the parameters of the model are studied. Finally, the model is applied to actual project to validate its’ applicability.