Abstract: A new method of virtual prototyping modeling was proposed based on assembly model, concerning the relation between assembly forms and dynamic constrains. With the transformation of assembly forms and dynamic constrains, a virtual prototyping model was built by the use of constrain models. Analysis of principle of modeling virtual prototype based on assembly was carried out, and the corresponding relationship between the assembly constraints in Pro/E and constraint block was studied and the method of modeling gear transmission was researched. With the utility of SimMechanics, a model library facing mechanism analysis under Simulink, a concept verification of a simple self-built machine was executed. The result shows that the method of virtual prototyping modeling based on assembly model is feasible, and this method provides technological base for researching the prototype performance influenced by assembly.

Key words: assembly, virtual prototype, concept verification, dynamic simulation