For the existing problem of separating easily and bad durability of interface of pothole repair, a new type of 3D-geogrid was used to enhance the interface mechanical mechanism. Further, based on the finite element numerical method, the interface performances with or without 3-D geogrid were investigated comprehensively under considering the effect of the elastic modulus of filling materials, pothole depth, and location of the surface load. The calculated results showed that the presence of the 3D-geogrid on the interface improved significantly stress condition and lowered remarkably the shear stress and tensile stress of the interface, the later can be reduced to 44% of that for the original pavement, especially for the pothole repair with the higher elastic modulus of the fills. The increase of pothole depth resulted in the decrease of the shear stresses and tension stresses at the bottom interface, and the tension stresses became the 53% of that for the original pavement for the 0.09 m pothole depth. In addition, when the load moved to the lateral interface, the most unfavorable load position was reached, the presence of the 3D-geogrid on the interface, however, will result in reducing significantly stresses peak values at repair interface.