Aiming at the problems about that much concrete of old wharfs need to be repaired, and the repair performance of ordinary mortar need to be heightened, we prepare and test the repairing mortar addition of the PAE and silica fume for hydraulic concrete. The results show that mortar adding with PAE and silica fume displays higher bond strength，lower drying shrinkage, superior abrasion resistance and water impermeability compared with the control sample. These improvement is mainly attribute to bond action of PAE and pozzolanic effect and filling action of silica fume. Comparing with other repairing materials, mortar adding with PAE and silica fume shows excellent mechanical and durability and economy which is especially suitable to repair hydraulic concrete.