利用2000-2007年共计8年的逐日08:00和20:00 500 hPa高空资料， 结合地面降水资料和TRMM 资料， 对高原低涡切变线进行了普查分析， 获得了对高原低涡切变线活动的一些新的认识。（1）在青藏高原上， 切变线活动比低涡活动更活跃。（2）21世纪初的8年间， 低涡、 切变线出现个数最多的在6月， 最少的在9月。2002年和2006年分别是高原低值系统相对活跃和相对不活跃的年份。2006年川渝持续的高温干旱可能与高原低值系统活动不活跃有关。（3）低涡、 切变线生成的源地分析表明， 高原低涡、 切变线主要出现在海拔高度较高和地形坡度陡峭的地区， 高原加热和陡峭地形的动力作用可能是低涡、 切变线形成的原因之一。（4）高原低涡、 切变线不易移出高原。低涡移出， 主要是伴随低涡切变线过程东移。（5）低涡、 切变线经常相伴或相继出现， 对高原及高原以东天气产生重要影响。

Using the radiosonde data on500 hPa level at 08:00 and 20:00 in2000\_2007, the ground station observed rainfall data and TRMM satellite data, the shear line and low vortex over the Tibetan Plateau are investigated and analyzed. Some new understandings of the shear line and Plateau vortex activities were obtained. (1) The shear line is more active than the Plateau vortex over the Tibetan Plateau. (2) The most often appearance month of shear line and Plateau vortex are in June; the least, in September in the 8 years. And 2002 years is the more active year; 2006 years, less active year with two low weather systems only. Furthermore, the persistent high temperature and drought in Sichuan\|Chongqing in 2006 maybe has something with the less active low weather systems over the Plateau. (3) The shear line and Plateau vortex generation region indicates they are mainly appeared in high altitude and steep areas, which means the steep topography and Plateau heating are possibly one of the causes of the generation of the shear line and Plateau vortex. (4) The shear line and Plateau vortex are not easily moved out of the Plateau. When the Plateau vortex moved out of the Plateau, it is often moving eastward along the shear line. (5) The Plateau vortex and the Plateau shear line often appears concurrently or one after another, they have largely weather influence on the Plateau and on the east of the Plateau.