Abstract: Landsat-5 TM images of growing seasons and non-growing seasons for four forestry bureaux in northern Daxing'anling mountains of Inner Mongolia were used.Preprocessing of images including atmospheric correction,geometric correction,mosaic and cutting was conducted. Such jobs were also done as the statistical analysis of standard deviation,correlation coefficient and OIF index,analysis of the best band combination of two different date images.The results show that the best band combination of the study area TM images for the growing season is 345 and 234,the best band combination of non-growing season is 245,345 and 234.The results can be applied to use of TM images for forest resources information extraction.

Key words: date, TM image, the best band combination