As the internal organism of the brain,syntactic module and semantic module may work in the same way.

The paper presented the requirements and characteristics of the assembly model that uses the DMU,analyzed assembly constraint relations and represented assembly relations using assembly connection diagrams which contain assembly semantics.

According to the process from collection of users requirements, conceptual design and detailed design, modeling to assembly, after the extraction and classification of the complicated domain knowledge, we put forward three layers of semantics as design semantics, modeling semantics and assembly semantics, so more domain knowledge can be used in the process of design and involved in the fi.

Mainly disscussed using component module and assembly module and manufacture module of Pro/E software to design injection mold for the battery cover.

Inorder to solve the problem that low degree of automatic inthe blockmoduleassembly process negatively influences the construction cycle time and construction qualityin shipbuilding,this paper presents a newly developed decision-making system of assembly units for block module assembly.