With the development of the large scale vessel,the corner berth length of vertical quay wall for large scale terminals will usually cause more occupation of shoreline,when calculating with the vessel length parameters which is determined by the Design Code of General Layout for Sea Port.Based on the idea of original train of thought,the relations and regular pattern are analyzed and derived among the distance between ships or ship and the quay wall,ship dimension,in different angles,ship types and berthing circumstances.In addition,the paper presents vessel length factors in the shoreline corner in the case of asymmetric berthing.Meanwhile,vessel length parameters are optimized and fixed in different shoreline corners,on the basis of maneuverability experience of large scale vessel.The purpose of this study is to economize the resource of shoreline by moderately reducing the surplus berth length at the shoreline corner,which is in the premise of ensuring the safety of the maneuverability.