Abstract: Structure surface is an important factor in controlling rock property. In order to improve the rock properties of physical and mechanical, grouting technique is often applied in engineering. The structure surface of JRC-JCS model was studied. Based on it, comparison study was carried out before and after grouting of the rock structure on the surface. Studies show that JRC of surface structure greater increase than natural after the end of grouting. While the growth trend changes with the change of normal stress. After grouting the stiffness and shear strength of structure surface is improved, and the stiffness improvement is more apparent. The research results further prove that strength of fractured rock increase after grouting

Key words: Structure surface, Grouting, JRC-JCS model