Abstract: For the lock chamber wall repairing project of the Yanshao Lock, the in-situ injection tests of silica concrete with fine stones and properties tests of the sprayed concrete in laboratory are carried out. Test results show that the wet-injection silica concrete with fine stones can meet the design demands such as the compressive strength, the tensile strength, the flexural strength, the wearing-resistant and bonding strength between the concrete and the base, and that the concrete can be used as a repairing material for lock chamber walls.