In order to characterize intensities of small,irregular and frail lacquer films during conservation process, a fixture was developed in the lab. Together with a universal material testing machine, this fixture tool was used to quantitatively test intensities of lacquer films before and after softening. The experiment results show that a lacquer film from a lacquer coffin unearthed from a Ming Dynasty tomb in Shaanxi province was softened in polyethylene glycol (PEG) 200. The lacquer film intensity was obviously enhanced,and the restoration result was good. The work provides a scientific guidance for softening and restoration of lacquer ware which is unevenly saturated with water unearthed from the dry area of the North China.