Near Huangpu river wharf, a mooring dolphin for 10000 Tons oil tanker was planed to build by an oil refinery of Shanghai, which would be constructed with bored grouting piles. Tide, riprap, mattress, mud leakage and water gushing were experienced during the construction process. Through research and exploration, by the combination of grab, clay wall building, drilling with casing and the rotary drilling method, the difficult problems of boring in riprap, mattress and the quaternary sedimentary layer were successfully overcome with completion of the construction task.