In this paper,the mechanism of the protective layer and the cause of the cracking of the protective layer are discussed. The influence factors of the maximum crack width of the protective layer are analyzed by calculation formula. The result shows that the relatively reasonable thickness of the protective layer can control and reduce the concrete crack to a certain extent width.%探讨了混凝土保护层的作用机理及保护层开裂的原因，并通过计算，分析了影响保护层最大裂缝宽度的因素，指出采用相对合理的保护层厚度能够在一定程度上控制和减小混凝土裂缝宽度。
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