:Minqin oasis lies to the northeast of Hexi corridor and lower reaches of Shiyang river,the environment there had degenerated
obviously in recent 40 years.The hungriness of soil, death of vegetation and other facts about Minqin oasis were analysed,the cause of
formation from the change of climate and human activity had been analysed too,Several suggestions of environment protection were
put forward at last.

Abstract:Using the data of Dopplor radar and reanalysis data of NECP/NCAR, the rainstorm process which occurred on August 27,
28 in 2003 in Gansu province was analyzed in this paper. The results show that the reason of veer degree of zero speed line differing
from one side to the other side of the station was the big scale confluence adding on the warm advection, the structure offered advan-
tageous vertical vapor transportation and confluence rising for producing and maintaining strong precipitation; upwind section and
middle-small scale confluence ( divergence) were in close connection with strong precipitation and that is an important index on pre-
cipitation prediction; the region and amount of precipitation have connection with the amount of vapor flux transportation and the de-
gree of vapor confluence.