Abstract: in the summer of 2012,Hulun Buir City： main climatic characteristics of temperature and over the years （1981-2010 year average） data at the same time as compared with normal to high.The precipitation and the calendar year the corresponding period compared to the values,most parts of normal.Major weather events： early summer for multiple process of rainfall and dispersion rainfall,rainfall is wide,and the local short-time rainfall characteristics.The part of the heavy rain,hail and other severe convective weather,and triggered a flood disaster.A farming area and pastoral local areas of strong convective weather, and triggered a flood disaster.In late summer and no abnormal climate event.