The current design code for dry docks was published early and it is not suitable for many modern large ships, so it is in an urgent need of revising. In view of the 300 000 DWT crude oil tanker，finite element models of standard section of hull and piers are built by ANSYS. This paper analyzes the distributional coefficient of lateral load in different conditions of gravity and ballast, makes a comparison with dry dock design specification.There are different characteristics on distributional coefficient of lateral load to reference for revising of dry dock design specification.