Hexi Corridor has been investigated by many researchers as a focal region due to its unique ecological environment and climatic characteristics，in order to learn more about it，a preliminary introduction and some analysis on its climatic and hydrological characteristics as well as the changes of ecological environment are given out in this paper. Results are as follows：（1）There are some obvious regional differences in the effect of global climate change on temperature and precipitation in Hexi arid region；（2）In the influence of climate change，the surface runoff of Shiyang river in the east of the region is decreasing continually while that of Heihe river and Shulehe river in the central and western part of the region rising from 1950s ，and it is also predicted that the runoff of Shiyang river will be decreasing，but that of Shulehe river will be increasing；（3）The local ecological environment has been deteriorated due to climate changing and inconsequential human activities，especially in the lower reaches of the inland rivers；（4）As water resource is the essence of the formation and evolution of the oasis，the key point of the oasis sustainable development is to distribute and use water resource properly and protect water quality，at the same time ，other water resource supplement countermeasures should be adopted.

Based on meteorological data and social - economy data，the paper analyzed the characteristic of meteorological disasters occurred in Gansu province，the fact of climate change during recent 50 years was also observed. The results show that the ecological environment has been significantly affected by global warming and unreasonable human activities in Gansu province. The adaptive policies of climate change and sustainable development were also discussed in the paper.

The fact of global warming and the effects on ecological environment，society and economy in Gansu province in the background of global warming are analyzed with the interrelated materials in this paper.
The countermeasures against climate change andsustainable development are shown too.And those，to Gansu province，can be summed up as two primary problems.First is water problem.Water problem is primarily to utilize reasonably，manage efficiently，save water，exploit and utilize water resources by precipitation enhancement over the Mountain Qilian. Second is sand problem.The problem is crucially to hold back the process of desertification.As this paper’sview，this holding back can be realized by the optimum project for recovering vegetation which would be abstract edby quantitatively calculating the categories distribution，run and carrying capacity of local forest and grassp lanted by using Regional Climate-Ecology Mode according to ecological environment sincluding terrain，physiognomy，climatehydrology，soil and so on.

The annual precipitation variable characteristics andproduction structure were analyzed using a hundred years annual data of
precipitation in the main bo勿of arid and semi一arid area ,in Central Asia and northwest of China The results indicated that the patial distribution and time evolution of annual precipitation in this area not only show unitary features .but also unique feature.  In addition .a successful readjusted example of production structure was raised based on the analysis of rainfall characteristics in this area.