Abstract: A big crack could be seen on the tail of the Bixi, carrying the epilogue tablet of Chengde Mountain Resort epilogue.It would affect the stability of the stone tablet.Because of the irregular shape and huge size of the Bixi, it is difficult to measure the depth and trend of the crack on it by routine test methods.The effect of the crack and moisture on the Bixi could be analyzed by using infrared thermography based on the change of the temperature distribution in twenty four hours.