A dust storm attacked Beijing on April 6, 2000. The variation of meteorological parameters in the boundary and physical chemical properties of this dust events are studied. The results show that the dust storm leads to the distinct and sharp increase of wind speed, decrease of relative humidity, development of turbulence and mixing capability in boundary layer. The total soil mass concentration of dust on April 6 reached 3906μg·m^-3 , 40 times as that of the non dust weather days in 1999 spring. Mass concentration of dust with diameter above 16μm, 8μm and 2μm account for 67%, 78% and 94% respectively. Back trajectory analysis shows that this dust storm on April 6, 2000 originated from Mongolia and Inner Mongolia in China, and arrived in Beijing through long-rang transportation via strong northwest wind.