The method and technology of virtual 3d assembly are discussed, and the method of the valve assembly CAD design and emulation concept-oriented design is pointed out in the paper.

探讨了面向概念设计的产品虚拟三维装配建模过程和三维建模方法，提出了面向概念设计阀门装配CAD设计与仿真的思想和方法。

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The concept of process fusion of product design in a virtual enterprise and architecture of virtual enterprise oriented process fusion and activity integration were put forward.

提出了虚拟企业产品设计过程融合的思想，以及面向虚拟企业的设计过程融合与设计活动集成体系结构。

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Adopting the object-oriented design method, the detail design of some modules is given, which includes use case design, concept model and sequence diagram.

采用面向对象的设计方法，对部分模块给出了详细设计过程，包括用例设计、概念模型和顺序框图。

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