A three-dimensional simulation model for the defrosting performance of a car is created. With the grill angles of air duct outlet are selected as experimental factors and the heating air speed on windshield sur-face as objective function, and by using program integration to make Isight as upper layer software and integrating automatic mesh deformation software Sculptor with CFD software Star-ccm+, the sample data are obtained by auto-matic submission for calculation. The Latin hypercube design and the least square method are used to create a sec-ond-order response surface model for the heating air speed on windshield surface, and a parameter optimization is conducted with mixed-integer optimization algorithm. After optimization, the distribution of heating air speed on windshield surface is obviously improved and the results of transient simulation on defrosting show that the defros-ting speed is increased, meeting the requirements of national standard on the defrosting performance of vehicle windshield.%建立了某款轿车除霜仿真三维模型。选择风道出口格栅角度为试验因子，风窗玻璃表面风速为目标函数，使用程序集成的方法，将Isight作为上层软件，集成自动网格变形软件Sculptor和CFD计算软件Star-ccm+，自动提交运算得到样本数据。采用拉丁超立方设计方法和最小二乘法，创建了汽车风窗玻璃表面暖风风速的二阶响应面模型，利用混合整型优化法进行参数优化。优化后，汽车前风窗玻璃表面的除霜暖风流速分布有了明显的改善，除霜瞬态仿真结果表明，除霜速度加快，满足了国标关于汽车风窗玻璃除霜性能的要求。
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