Conceptual Design is now recognized as highly important when considering both the concurrent engineering aspects and the commitment of resources necessary to design and develop a product. Freehand sketch can be done with the pen. To be mainly used in mechanical design, one kind of the manipulations based on feature-gestures is proposed. The method can make interface more natural and more intuitive, which is used by the designers to express the design intention fluently. Through the fuzzy theory, we can achieve the fuzzy model of the free sketch based on the existing CAD system by making use of the object-oriented technology. It can record the model information completely and adds the constraints to the feature levels. With the clearly data structure to store the constraints model, we can implement the spread and solving of the constraints conveniently.
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