In order to study the heavy metals contamination of street dusts in core zone of Chongqing city,the total contents and extracted heavy metal content by simulated acid rain of As,Cd,Cr,Cu,Hg,Ni,Pb,Zn were analyzed,meanwhile,corresponding properties including pH,organic matter(OM),total nitrogen(TN),total phosphorus(TP) and total potassium(TK) were also analyzed.The results showed that: (1) in different functional zone,the medium size particle account for about 50% of the total street dust.The contribution of different size particle to heavy metal content as follows: for different element,the finer the particle,the greater the contribution is,but for different functional zone,the medium size particle almost has the same contribution as the finest particle;(2) the street dust were alkaline and had potential organic pollution;(3) the total heavy metal contents of street dusts in Chongqing had great difference,and the elements seriously influenced by people were Cr,Cd,Hg and Cu;(4) the Nemerow comprehensive index indicated that the street dusts were contaminated by seven kinds of heavy metals except for Ni,while all functional zones were polluted seriously;(5) the total heavy metal contents of street dusts in Chongqing only had remarkably positive correlation with TP.