According to many scholars’studies on the Northwest China，this article summed up the ecological environment，climate hange features and trends in the Northwest China．Due to some coupling relationship existing between climate，environmental change nd sandstorm frequency，the paper briefly described some climatic factors influencing dust storm frequency，and combined with the elevant arguments to explore the climate and environment changes how to impact on occurrence and development of sandstorm in Northwest China．Many researches show that the development of dust storms is directly affected by the wind，precipitation and status of underlying surface，etc．The frequency and intensity of dust storms are closely related to the natural conditions and climate of sandstorm ources，and gale is a bigger influence factor under certain underlying surface condition．The increase of precipitation has a certain inhibitory effect on sandstorm，the temperature has the indirect effect through atmospheric circulation on duststorm，and soil moisture’s nfluence on sandstorm by changing the vegetation cover，surface condition．

Sandstorm is a severe weather phenomenon in China．Locating in the northeast of Hexi corridor，Minqin is surrounded by deserts，under the bad natural environment，it is becoming one of the most sandstorm outbreak areas in China．Based on the longterm sandstorm observation in this region，the interannual rule of sandstorm breakout was studied．Results show that the general trend of sandstorm outbreak was reduced，and for a certain period it had the oscillation with peak or trough．The outbreak of sandstorm had 5 or 15 years periodic change，and in different seasons it has a slightly difference．Using NECP/NCAR data，the 500 hPa height field in spring of typical years was analyzed，and we found a height field feature that has a close realtionship with sandstorm breakout in Min-qin area．Near the Obama hyjal lake and Balkhash Lake there was a high value system and a low value system，they may appear at same time or alone．When Minqin is controlled by high value system in spring，sandstorm will reduce，but when controlled by the low value system，sandstorm will be more in Minqin．