Heavy metal contents in top soils in agricultural soils of Zhejiang province and their differential characteristics and effecting factors were studied in the presented paper through field soil investigation.Averages of total Cd,Cr,Pb,Zn,Cu and Ni,except As and Hg,in the 904 selected soil samples were higher than the contents in top soils based on the second general survey of soil of Zhejiang province.The result showed that most of the heavy metal contents were enhanced excessively contrasted with the background values of Hangjiahu plain,Zhejiang province,China and the whole world.It was found that heavy metal contents exceed the threshold levels according to the second grade of standards for soil environmental quality of China(GB15618-1995),the index of exceed the provided standard of Cd,Ni,Hg,Pb,Cu,Cr,As and Zn were 10.72%,9.70%,6.80%,5.35%,3.43%,3.03%,1.80%and 1.04%,respectively.Moreover,land use,parent material and soil type were analyzed by the variance analysis to study the influence to heavy metal concentrations in agricultural soils by these effective factors.