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At present most of software in styling and design, no matter single or integrate, utilize the spline curve as their basis method of surface creating. And the NURBS technology is applied broadly. However, considering the computing time, system resource, and in order to create high quality surface model quickly, the paper brings out and describes the PDE method and its application to surface modeling. PDE, that is partial differential equation, is a numerical method to solve boundary question. The paper will discuss the approach and its application in the following aspects: (1) Application type of the PDE in engineering; (2) Method to control surface shape; (3) Definition the boundary conditions; (4) Managing the CO four side face; (5) Managing the C1 four side face (6) Tackling the triangle face; (7) Interface of PDE to NURBS. The PDE method has many computing techniques, it is easy to write program, and the surface created using this method is smoother than the conventional method.

With rapid progress of information technology, computer has been applied broadly and heavily into automobile panel design and manufacturing. In order to survive in the market and meet various demands of customers, the paper brings out about the integrated design method that considers the whole life cycle of part development and makes data flow fluently between part modeling and die machining. CAD model is very important in the product defined digital model. This gives a summary of panel modeling process based upon the point of application and many examples. There is a detail description on some important issues relevant with part modeling such as modeling types, key techniques and challenges. The panel dies have serious effect on the part quality and design to consistency. It is necessary to define the features respectively and append machine feature to the design features, so that CAM module can read CAD data directly and make the integrated design reality.