Abstract: To fit the request of feature semantic modeling system better, encapsulate more complex semantic with fealures in the CAD/LAID system, and increase the modeling efficiency, a feature-semanticbased representation was proposed. It built all features' faces by the feature semantic,managed all the features' elements on the cellular model,and verified the validity of the feature semantic by testing the wholeness of faces instead of constraint solving used in the modeling system which is based on the traditional representation. This representation can not only represent complex semantic of product models, but also enhance the performance of the semantic feature modeling system greatly. Experiments on computer show that this new algorithm is more adaptable and practicable.

Key words: Feature semantic, Representation, Semantic feature modeling, Cellular model, Feature dependent graph