沙漠化是干旱、半干旱及部分半湿润地区由于人地关系不相协调所造成的以风沙活动为主要标志的土地退化。榆林地区是我国北方典型的农牧交错带，是沙漠化正在扩展、治理、逆转的地区，该区沙漠化的历史变迁和现实状况在很大程度上代表了我国北方农牧交错带人地关系的许多典型问题。 本文根据沙漠化理论及风洞实验，依据30年来该区气象和社会统计资料，运用Excel、R2V、Photoshop等软件工具和数理统计以及灰色理论方法，系统分析了榆林地区近30年的气候变化，探讨了该区现代沙漠化过程中的驱动因素和沙漠化防治措施，得到以下几点结论： 1.从气温和降水的组合模式来看，该区呈干暖化趋势，气候驱动因子呈现出有利于沙漠化扩展的趋势，但这种自然驱动力作用被有利于沙漠化逆转的驱动力所抵消，即人为驱动因素，所以对该区沙漠化过程趋势分析应更加关注人类活动对其扩展或逆转。 2.从影响该区沙漠化的主要驱动因素来看，榆林地区沙漠化主要气候影响因素是冬季平均气温、年降水量、春季蒸发量，风蚀沙漠化主要发生在春季；从社会因素来看，影响沙漠化最主要因素是造林面积，验证了当地植树造林措施是行之有效的。 3.通过实验发现，在不同的风速下，植被以紧密型排列时各个观测点的风速降低幅度最大并且整个风场内的平均风速降低幅度最大，因此合理的林区规划是防治本区沙漠化的重要组成部分。 4.在沙漠化防治方面，根据冬季平均气温和年降水量对农业生产进行调整，可减轻土地沙漠化，达到保护农业生产环境的目的。

The sandy desertification is land degradation characterized by wind erosion mainly resulted from the incoordination between human beings and natural conditions in the arid, semiarid and partly sub-humid regions. Yulin region is the typical agro-pastoral mixed regions in North China. It is the region where sandy desertification is taking place, combated and reversed. To a large extent, the historical change and real situation of this region represents many typical problems about human impact and natural conditions of Agro-pastoral Mixed Regions in North China. Based on meteorological data and social statistical data of this region in recent thirty years, the article makes use of the theory of sandy desertification and wind tunnel, applies Excel, R2V, Photoshop software, mathematical statistics and gray theory, systematically analyses the climatic change in recent thirty years, and discusses the modern Sandy Desertification driving factors and combating method in this region. After analysis and research, the following significant conclusions are drawn: 1. From the point of the integrated mode of temperature and precipitation, it is posing the trend of warming and drying, and the climatic driving factor is posing the trend in favor of sandy desertification. However, the natural driving force was counteracted by driving force for reversion-human impact, so the trend analysis on sandy desertification process in this region must pay more attention to human impact on the development and reversion of sandy desertification. 2. From the main driving factor of influencing sandy desertification, we can see that, the main factors in Yulin region are the average temperature in winter, the annual precipitation, and the evaporation capacity in spring and the wind erosion mainly takes place in spring. From the social factor, the main factor influencing sandy desertification is the planting area, which proves that the tree planting and afforestation measures in this region are effective. 3. By the experiment, we can see that, at the different wind speed, when vegetation is ranged in the closeness shape, the wind speed at every testing point declines by the biggest extent, and the average wind speed declines also by the biggest extent. Thus, the proper forest region planning is an important part in preventing sandy desertification in this region. 4. In the aspect of preventing sandy desertification, we shall regulate the farming production by the winter average temperature and the annual rainfall, so that sandy desertification can be relieved and the production environment of farming can be protected.