Abstract: Feasibility to directly moor alongside for 30 000 tonner or below oil tankers is demonstrated in the precondition of keeping current equipments and facilities for 30 000 tonner oil tanker wharf in Cezidao.Differences between 30 000 tonner or below oil tankers and original desinged mooring vessel's form of Cezidao Wharf in vessel's form size, deadweight tonnage and impact force, control of moor alongside and unberthing and natural condition are summarized, and adaptabilities in the space between mooringdolphins, the wood fender position and topside in vertical position and the angle and length of mooring lines are analylized, and relative management measures are proposed.