Dust storm in Korea on March 21—22,2002 is studied using the satellite remote sensing data,weather charts and NCEP/NCAR reanalysis data.Results show that Mongolia was the initial source of the dust storm influencing Korea,where it occurred between high pressure and cold front.The dust storm occurred in central Mongolia on March 19—20 and affected Korea on March 21.The maximum concentrations of PM10 were 2778.2 μg/m³ in Korea,but strong wind made it rapidmy pass away.