The effects of three low molecular weight organic acids (LMWOAs)and the medium condition (-HPO^2-4) on Pb, Cd, Cu and Zn leaching in contaminated soil were investigated by simulated leaching experiment. The results showed that Pb, Cd, Cu and Zn in the contaminated soil can be partly dissolved by different LMWOAs solutions in batch experiment. The leaching trends of Pb, Cd, Cu and Zn by LMWOAs in soils were:citric acid〉tratric acid〉oxalic acid for Pb and Cd, citric acid〉oxalic acid〉tratric acid for Cu, tratric acid〉citric acid〉oxalic ...