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在特征造型基础上阐明了零件和装配体中尺寸、公差的表达和记录，并讨论了尺寸、公差链自动建立的一种方法，以便进行公差分析与综合，使产品成本和精度最佳协调。在产品的三维实体模型上，设计者只需捡取待分析的封闭环的两个端元素，程序就会在零件模型和装配模型中自动搜索建立与此封闭环有关的尺寸链，并确定尺寸链各环的增减性。
On the basis of feature modeling, the dimension and tolerance of parts and assemblies are expounded and recorded. A method of automatically establishing the dimension and tolerance chain is discussed in order to analyze and synthesize the tolerance so as to achieve the best coordination of product cost and accuracy. In the 3D solid model of the product, the designer only needs to pick up the two end elements of the closed loop to be analyzed, and the program automatically searches through the part model and the assembly model to establish the size chain related to the closed loop, and determines the size Chain addition and subtraction of the ring.