Abstract: TM information from the middle parts of the Tianshan Mountains was specially pro– cessed in the paper．A superior band conbination was screened out that would be advantage us to the forest land identification automatically by computer through image enhancement to stress forest land in– formation,through PC transformation and ratio processing in order to remove the shadow of the moun– tains．This research has laid a foundation for TM data application to forestry imventary in Xinjiang．

Key words: Image enhancement, PC transfer, ratio proccessing, band combination