Concretes with different strength grades were dried in a thermostatic electric drier with forced convection at 60, 80, 105, 120, 150℃.The change of drying rate, completely drying time and amount of water loss were analyzed.The results show that under the same temperature, with the increase of concrete strength grade, the drying rate becomes smaller, the completely drying time becomes longer, and the total amount of water loss becomes less.With the same strength grade of concrete, the drying rate is higher, the completely drying time is less, and the total amount of water loss is more under higher drying temperature.When drying temperature is higher than 80℃, the crystal water begins to loss, and the higher drying temperature, the more crystal water loss.According to the modified Page model Ⅱ, a model of drying for C20C50 concrete at 60150℃ is established considering the effects of drying temperature and strength grade.