Abstract: According to the “Forest Ecosystem Services Assessment Standards” （LY/1721-2008）, and based on the data from the eighth national forest resource inventory of Xinjiang Province, longterm monitoring data by Xinjiang Tianshan forest ecosystem research station and Aletai Mountain forest ecosystem research station and public data, the service function total values of 14 major dominant trees, two stand types and five arbor age groups in Mountain forest ecosystem in Xinjiang Province were evaluated. The results showed that the total value of the service functions of mountain forest ecosystem was 86246 × 108 yuan/a; The value order of individual service function was water conservation > carbon fixation and oxygen released > species conservation > soil conservation > atmosphere environmenta1 purification > nutrient accumulation. The ecosystem service value of arbor and shrub occupied 6927% and 3072% of the total value, respectively; The ecosystem service value of Tianshan and Aletai mountain occupied 5734% and 4246% of total value, respectively; The total value order of five age group was mature forest > overmature forest > nearmature forest > middle age forest > sapling forest. The value of per unit area ecosystem service was 359 × 104 yuan/(hm2·a)， of which arbor and shrub was 509 × 104 yuan/（hm2·a） and 201 × 104 yuan/（hm2·a）；Tianshan and Aletai mountain forest was 330 × 104 yuan/（hm2·a） and 377 × 104 yuan/（hm2·a）；The value order of per unit area ecosystem service of five age groups was overmature forest > middle age forest > mature forest > sapling forest > nearmature forest.