公差是机械制造过程中最重要的参数之一 ,其对加工成本和产品质量有很大影响。以最低加工成本为目标 ,根据成本与公差间的函数关系 ,建立了非线性的公差优化模型 ,并采用遗传算法解决了多零件多工序非线性公差综合优化问题。实例证明该优化模型正确 ,算法可靠 Tolerance is one of the most important parameters in the mechanical manufacturing process, which has a great impact on the processing costs and product quality. With the goal of minimum processing cost, a nonlinear tolerance optimization model is established according to the functional relationship between cost and tolerance, and the genetic algorithm is used to solve the problem of multi-part and multi-process nonlinear tolerance comprehensive optimization. The example proves that the optimization model is correct and the algorithm is reliable