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分析双向板开裂的主要原因后，比较了国内外对裂缝的控制，推导了从控制裂缝宽度角度出发的双向板厚度估算公式。比较国内外研究者提出的双向板裂缝宽度计算公式，经与试验结果比较，讨论了双向板裂缝宽度影响因素。除与单向受弯构件相同的影响因素外，还有板的钢筋布置和内力重分布幅度等因素，从能反映双向板主要影响因素的角度出发，建议采用修正系数后的Ｎａｗｙ－Ｏｒｅｎｓｔｅｉｎ公式。
After analyzing the main reasons of cracking of two-way slabs, the control of cracks at home and abroad was compared, and the formula for estimating the thickness of two-way slabs from the perspective of controlling crack widths was deduced. Comparing the calculation formulas of two-way slab crack width proposed by researchers at home and abroad, the factors affecting the crack width of two-way slabs are discussed after comparing with the experimental results. In addition to the same influencing factors as the one-way bending members, there are factors such as the plate reinforcement arrangement and the internal force redistribution amplitude. From the perspective of reflecting the main influencing factors of the two-way plate, the Nawy-Orenstein formula after the correction coefficient is recommended.