The "7·9" torrential rain,which occurred under the weather situation of a shrinking subtropical high,jet developed from the peripheral southwest current and shear line passing at 850hPa level is analyzed by taking into consideration the main influential system,various physical features,satellite images as well as topography.

Through analyzing the large-scale circulation patterns and principal impacting systems of this snowstorm,as well as the physical characteristics such as water vapor conditions and dynamic conditions,we understood and mastered the causes and regulations of this snowstorm.

Through the analysis and research of the regional geophysical field characteristics, geoelectrical chemical characteristics and the result of the confirmation hole, the prospecting result of the geophysical prospecting method in the study area is discussed in detail.

It is supposed that the deferent geophysical field characteristics of Qilian Orogen Belt from the surrounding area should be the evidences to classify tectonic element, internal structures of basement is characterized by zoning from south to .