An Abu Dhabi port is proposed to modify existing container yard layout form according to its own development needs.The large live load is applied to the constructed rainwater drainage pipelines after reconstruction project.This paper analyzes that whether the rainwater drainage pipelines are damaged or reinforced after reconstruction project,and apply the American standard to calculate and check for GRP pipes deflection deformation.According to the calculation results,the existing GRP pipes can meet the demand of the yard after transforming except any reinforcement measures.