Corrugated paperboard was treated under different environmental conditions of temperature and humidity,which were temperature of 23 ℃, relative humidity of 40%, 50%, 70%, 80%, and 90%. Water content, bursting strength, and edgewise crush resistance of the sample were determined in accordance with the relevant standards immediately after the treatment. Test results showed that with the humidity increase, the water content increases, the bursting strength and edgewise crush resistance of corrugated paperboard become poor, and the downtrend of edgewise crush resistance is more obvious.