Abstract: Abstract: 【Objective】The spatial distribution of forests in Altay Forest Farm were quantified by Remote Sensing and GIS methods, to provide foundation and support data for quantitatively assessing the ecological functions of forests. 【Method】DEM, Landsat, meteorological data and field investigation of forest resources were used to analyze the spatial relationships between arbor forests and topographic factors by 3S technology. 【Result】The topographic factors are significantly correlated with the spatial distribution of arbor forests at the 0.01 significance level. Just over 90% of arbor forests are distributed at an altitude of ≥1 500-2 400 m, among them, 39% of arbor forests are distributed at an altitude of ≥1 800-2 100 m, 27% of arbor forests are distributed at an altitude of ≥2 100-2 400 m, there are very few arbor forests are distributed at an altitude of ≥900-1 220 m and ≥2 400-2 700 m; the suitable areas for woodland growth are the north, northeast, and northwest slopes, as 78% of arbor forests are distributed among these areas, and 45% of arbor forests are distributed in north slope, 33% of arbor forests are distributed in northeast, and northwest slopes; 85% of arbor forests are mainly distributed throughout slopes, steep slopes and acute slopes, and the largest distribution index is in steep slopes, up to 37%.【Conclusion】The main ecological factors that affect the spatial distribution of arbor forest are altitude, aspect and slope. The suitable area for the growth of arbor forests in the Altay Mountains is at the intersection of elevation(≥1 500-2 400 m), aspect(north, northeast and northwest slopes), and slope(throughout, steep and acute slopes).