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.Process planning is the link between CAD and CAM. The design drawpiece influences the quality of NC programming and machining. The paper describes some researching work on drawpiece planning with many cases of design.The integration of panel design and manufacturing is a general trend. In the mode of integrated environment, all the relative elements in the whole design should be considered synthetically, which will lead to its automation and intelligentialize of part production.