The paper used decision tree automatic threshold classify model to study land use and land cover in Shangri-la County with Landsat ETM+ image in 1999, and got two results. The first result is the land use and land cover map, the second result is the surface features area statistical result from large to small: bush, spruce and fir, meadow, pinus densata, ice and snow, pinus yunnanensis, unutilized land, paddy field, town, dry land , marsh, water. Bush has the largest area, 4267492200m2, while water has the smallest area,6147900m2.