By using the reanalysis data ofNCEP( 1°×1°) and the radiosonde and surface observations aswell as the Doppler radar products, the features of a strong dust storm occurred on 13 June 2008 in theHexiCorridor are analyzed. Results show that the upper cold airmoved fast and overlapped on the surface cyclone resulted inmeso-scale convection system developing fast. The dry-warmlid at the level of500-540 hPawas advantageous to the instability energy accumulation at low level and itwas importantomen for the strong convection weather.The convection system took place firstat the low layerbefore the sandstorm outbreak, then quickly developed tomiddle layer. The sandstorm occurred in theweak echo areawhichwas in frontof the strong echo and in the adversewind region of radial velocity

Based on the dailymean air temperature, the dailyminimum air temperature and annual p recip itation data from six counties ( district) in the middle part of the Hexi Corridor during 1961 - 2006, the accumulative temperature, no frost period and the agriculture climate p roductivities are calculated in each area, and the influence of climate warming on agriculture is analyzed. Results show that the air temperature p resented increasing trend since the 1980 s, and the average temperature during 1987 - 2006 increased obviously. Due to the accumulative temperatures ( ≥0 ℃ and ≥10 ℃) increase and the frost - free season p rolongation, the climate p roductivity increased also. Obvious climate warmingmade the thermophilic crop area enlarge and multip le crop index imp rove, and it is benefit to winter vegetables in greenhouses. Meanwhile, drought occurred frequently and the survival rate of disease - pest living through the winter rose, which led to the cost of agriculture p roduction increase.