This research task is supported by 'Research on CAD of Hydraulic Manifold Blocks based on Intelligent Optimization and Virtual Design' (50375023) from National Natural Science Foundation of China.The assembly of hydraulic manifold block(HMB) is a process of assembling different kinds of hydraulic parts in the integrated block according to certain assembling relationship and function requirement, which under the condition of rational arrangement and layout of hole.The design of assembling relationship is not...