Distribution and characteristic of Cd,Cr,Cu,Hg,Pb,Zn,Ni of urban dust were analyzed on regional scale coming from forty-seven cities.The results showed that heavy metal concentrations were divided into five grades,and change from one to four times standard deviation.In space scale,they were high in western and southern,and low in eastern and northern,and reduced from southwest to northeast.The order of heavy metal content in each region was Southwest ChinaNorthwest ChinaSouth ChinaEast ChinaNorth ChinaCentral ChinaNortheast China.In addition,some elements,spatial distribution was consistent with the stepped topography of China.Soil background and human activity were important factors,the former mainly influenced North China,Central China and Northeast China,the latter played an important role in Northwest,Southwest and South China.The order of disturbance on heavy metal was CdHgZnPbCuNiCr.