通过对食品包装机械的研究及设计方法的优化，分析了设计食品包装机械时所关联的属性，利用属性约束和产品数据管理系统（PDM），规划并建立了属性间的关联矩阵、知识推理规则和知识库，提出了优化设计时的实施算法。实践表明，利用属性约束进行优化设计规划和设计算法，使设计速度提高了30%左右，可使设计模式更进一步地向模块化和推理化的目标发展。

The attribute association in food packaging machine design was analyzed. The incidence matrix of attributes, knowledge reasoning rules, and the knowledge base were established by using attribute constrains and PDM. The implementation algorithm of optimum design was put forward. It was proved by practice that the optimal design planning and algorithm using the attribute constrain can improve design efficiency by 30%, and it can made design mode develop towards the goal of modularization and knowledge reasoning.