Abstract: Taking mass loss as the intensity damage indictor after the heat treatment was applied to the wood, the impact of heat treatment on the color of Betula alnodies wood was studied, and the correlation analysis between the mass loss and color change was conducted. It was showed that the lightness of the wood was decreased, whereas the color difference was increased along with the increment of treating temperature and treating time duration. There was no distinct rule for the change of the color parameters L*, a*, and b* determined by the CIELAB method. The mass loss was increased with prolonging of the heat treatment, which might be applied as a right index to indicate the lightness change and color difference before and after the heat treatment.