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摘要： 基于DEM数据，利用中心像元与相邻8个像元模型计算了位于陕西境内的秦岭腹地地表面积，结果表明：①秦岭陕西段地表面积为75 224.67 km2，与垂直投影面积61 641.27 km2相比增加了22.04%；②秦岭陕西段地表面积与垂直投影差异与海拔的关系呈类抛物线趋势，海拔高度为2 000 m时二者的差异达最大；③与垂直投影面积相比，秦岭陕西段低山、中高山以及亚高山面积分别由19 258.34 km2、33 654.18 km2、3 789.32 km2增加到21 559.88 km2、39 836.85 km2、4 480.92 km2，增长比例分别为11.9%、18.4%与18.3%；④秦岭陕西段不同土地利用类型的地表面积与投影面积均存在差异，未利用地地表面积与垂直投影面积的差异最大，达34.4%，林地次之，差异为27.7%，再次是草地，差异为22.4%左右，农田、其他林地、水域、居民地与工矿用地的地表面积与投影面积的差异较小，依次为12.5%、8.5%、5.4%和2.5%。 关键词： 秦岭;  地表面积;  海拔高度;  土地利用     Abstract: Based on DEM of Qinling Mountains, used the model of the center cell and the adjacent eight cells, we calculated the surface area of Shaanxi section Qinling Mountains. The results shows that: (1) The surface area of Shaanxi section Qinling Mountains is 75 224.67 km2, which is an increase of 22.04% from the vertical projection area；（2）The relation between the difference of surface area and vertical projection area and elevation is parabolic. The altitude of 2 000 meters is the area with the largest difference between the surface area and the vertical projection area in Shaanxi section Qinling mountains；（3）Compared with the vertical projection area, the area of low mountains, medium mountains and submountains in Shaanxi section of the Qinling mountains increased by 2 301.54 km2, 6 181.67 km2 and 691.60 km2 respectively, with the growth rate of 10.68%, 18.37% and 18.25% respectively.（4）The difference between the surface area and the vertical projection area is various in different land use types. Not using land is the largest, the difference is 34%. The second is forest land which the difference is 28%, and the lawn is approximately 20%. Difference is small in farmland, other forest land, water and residents and industrial land, which is 12%, 8%, 5% and 8% in turn.

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