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讨论了箱体、墙板等复杂零件形状特征的生成及造型策略．阐述了各类特征模型的构造方法，并给出了基于特征的产品定义模型结构及ＣＡＤ／ＣＡＰＰ集成的产品定义文件．解决了形状特征类型自动识别及特征正负状态判断等技术难题．
The shape features of complex parts such as box and wallboard are discussed. The construction methods of all kinds of feature models are expounded, and the structure of product definition models based on features and the product definition files of CAD / CAPP integration are given. It solves the technical problems of automatic recognition of shape feature type and judgment of positive and negative status of features.