A dust event that passed over Dalian(38.90°N,121.63°E) on November 6,2005 has been observed by a micro-pulse lidar(MPL) of China-Korea cooperative Dust Monitoring Program.It is found that the dust layer extended upwards from 1 to 2 km above the ground level,with a peak extinction coefficient of 1.08 km^-1.Additionally,the aerosol optical depth(AOD) of this dust air mass accounts for 47% of that for the whole air column.The extinction coefficient on the ground surface increased to 0.23 km^-1 when the dust entered to the atmospheric boundary layer in Dalian.The dust aerosol layer related closely with the vertical distribution of the meteorological parameters which was characterized by lower RH associated with the arid condition in desert area.The mass concentration of PM₁₀ increased to 1678.9 μg/m³ when the dust air mass affected Dalian,which is in good agreement with the temporal evolution of the ground extinction coefficient retrieved from the MPL data.The conversion scale between the mass concentration of PM₁₀ and the ground extinction coefficient varied in the range of 1.94 to 6.50 mg·m^-3·km^-1.