In order to solve the problem of automatic generation of assembly dimension chains, a new method based on information cells is proposed. First, a hierarchical assembly model is established, the dimension & tol-erance information cells and assembly constraint cells are built. Meanwhile, tolerance information is normalized. After that, the transfer diagram of assembly relations is constructed based on the relationship between information cells, and the assembly dimension chain is generated with consideration of the searching priority. Finally, a pro-totype system is developed based on CATIA V5 platform, and an example is given to prove that the proposed method can effectively improve the accuracy and success rate of the automatic generation of assembly dimension chains.%针对装配尺寸链自动生成的难题，提出一种基于信息单元的装配尺寸链自动生成方法。通过建立层次化的装配模型，提出并建立了尺寸及公差信息单元、装配约束信息单元，同时对公差信息进行了规范化处理；在此基础上，基于信息单元间几何特征的关系构建了装配关系传递图，在考虑搜索优先级的基础上实现了装配尺寸链的自动生成。最后基于CATIA V5平台开发了原型系统并进行实例验证，证明了该方法可以有效地提高装配尺寸链自动生成的准确性和成功率。
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