Numerical analysis of the internal force of breast wall is performed to the problem of non-uniform settlement commonly existing in the concrete block quay wall.According to the static and contact analysis method of the finite element software ANSYS,we calculate the internal force of breast wall under the action of self-weight and operation loads.The analysis results show that the internal forces of breast wall increase significantly by the effect of non-uniform settlement.Therefore,some design and construction measures should be considered to reduce the effect of different settlement to the capping beam.