Abstract: The interface between the diaphragm wall and the surrounding soil is prone to diseases, and high polymer grouting is an effective means for repairing and reinforcing the interface. In order to study the bond properties of the concrete and silt interface after high polymer grouting, the design methods of orthogonal tests are employed, and a constant-pressure grouting system designed and manufactured by the author's team independently and a high polymer developed independently are used for infiltration grouting at the concrete-soil interface. Through the straight shear tests onf the specimens after grouting, the influences of different factors on the interfacial shear strength and strength parameters are investigated. The digital image correlation (DIC) is used to analyze the evolution of interfacial shear damage during the straight shear test.