The pressed line of corrugated board was locally coated with PVA coating, and the folding endurance and bursting strength of PVA-coated and non-coated corrugated board was tested in environmental humidity of 25%, 35%, and 50% respectively. The influence of local coating on corrugated board cracking phenomenon was analyzed. The results showed that under the relative humidity of 25%, PVA-coated board does not show obvious improvement on the "Burst line" phenomenon; under relative humidity of 35% and 50%, PVA-coated can effectively change the corrugated cardboard "burst line" phenomenon.