The automotive air reservoir,which is an important part of automobile parts,plays an important role in storing the compressed air and braking. The air reservoir is designed by considering the pressure,material selection and shape in detail in the paper. The optimal wall thickness of the air reservoir is obtained by optimization design by means of ANSYS software. The analytical results show that the cylindrical aluminum alloy air reservoir with optical wall thickness can reach the design requirements of light-weight automobile.% 作为汽车零部件的重要组成部分，储气筒起着储存压缩空气以及刹车制动的作用。从工作压力、材料选择和外形设计等方面对储气筒进行分析，利用ANSYS有限元软件对储气筒壁厚进行优化设计。在此基础上，指出采用最佳壁厚的圆筒形铝合金储气筒能达到汽车轻量化的设计要求。
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