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This article took Shangri-La County as the study area , based on the study of changes of landscape types and driving force system. The visual interpretation acquired the data of spatial distribution of landscape types, from 1974, 1989 and 2000, in Shangri-La County by the RS(Remote Sensing) and GIS(Geographic Information System). In order to analyze quantitatively the characteristics of spatial variation of natural woodland , this article used the spatial analysis function of GIS . At the same time, the driving force of natural forests change were analyzed , based on the spatial analysis and the location theory methods . we analyzed the impact of terrain factors on changes of landscape types by the data of altitude, slope and aspect ,as well as the relationship between landscape change and settlement, road and infield by the use of weighted cost grid resulting from altitude, slope and water system. It’ll provide some reference for the development of sustainable forest management. Preliminary conclusions were as follows 1) From 1974 to 2000 , the trend of landscape change in Shangri-La County was that the type of artificial land, agricultural land and coniferous forest were on the rise year by year, shrub grassland, evergreen broad-leaved forest, mixed forest, deciduous broad-leaved forest, wetlands appeared to have an ascent trend after an initial decline ,meanwhile the trend of non-use land, water body and snow tended to decrease each year .(2) The natural forests in Shangri-La County were tending upward from 1974-1989, mainly converted from other types to this type, which were tending downward from 1989-2000 , showing a balanced two-way conversion situation, but the natural forest converted to other types more .(3) The elevation to the wildwood changes influence performance was: the average altitude of 3200m surface was definition as the Reference surface, the interval according to 500m elevation data will be carried out subparagraph . The minimum and maximum elevation of natural forests changes were distributed in the 1520m and 5040m . We calculated the percentage of the natural forests in the elevation. In 1974-2000, there were about 65% increase of natural forest mainly on the elevation range of 3200 ~ 4200m , about 20% changs of natural forests on the elevation range of 3200 ~ 1520m , about 15% changs of natural forests on the elevation range of 4200 ~ 5040m . Therefore , the changes of natural forests was the most active in the range of 3200-4200m , and then as the elevation increases, the changes of natural forests decrease .(4) The slope to the wildwood changes influence performance was: there were about 75% chang of natural forest mostly on the slope range of 0°~ 30°. This region was easily the human activity influence . there were 25% chang of natural forest on the slope﹥30°scope . This indicated that the wildwood change was been big the slope influence, the wildwood change along with slope increase, its change reduces gradually.(5) The slope to the wildwood changes influence performance was : in two change time section , the conservative slope (does not have slope ) the region wildwood change was smallest, occupied the change area 1.3%. The shady side wildwood change was biggest, occupied the change area 66%, the sunny slope wildwood change occupied the change area 33%. This indicated that the wildwood was bigger than the sunny slope obviously on shady side change.(6) In human activity influence aspect, in two change time section , the relationship of natural forest changes and the distance from the urban and rural settlements was attenuation by three times equation meant that urban and rural settlements has a great impact on changes in natural forests, besides, this influence is not a simple linear relationship. The decrease mainly resulted from cutting down around the urban and rural residents while the increase resulted from afforestation in the surrounding settlements and the closing hillsides to facilitate afforestation far away as well as the natural recovery of woodland .(7) The road and railroad to the wildwood change’s influence performance was: in two change time section , the closer the distance from the road, the more dramatic changes in natural forests. In the period of 1974-1989, the relationship between the increase of natural forests and the cost distance from the road was decay by quadratic curve equation while the relationship between which and the decrease was logarithmic decrement .In 1989-2000, the relationship of the former kept itself, but the latter appeared exponential decay. (8) The infield to the wildwood change’s influence performance was: in two change time section , the closer the distance from the infield, the more dramatic changes in natural forests. In the period of 1974-1989, the relationship between the increase of natural forests and the cost distance from the infield was attenuation by three times equation while the relationship between which and the decrease was inverse equation decrement . In 1989-2000, the relationship of the former appeared three times equation decrement , but the latter appeared inverse equation decrement .The natural forests has decreasing trends, also, the economy and population will continue to grow in Shangri-La County, then the human’s demand for environment and the forest resources will increasing in future. Therefore, we engage in the forest management to strengthen and fasten the good opportunity about the wildwood protection and Returning farmland to forests. To increasing the afforestation area and the forest resources will sustainable development in Shangri-La County .