This paper reports the efficiency of a biosurfactant tea-saponin on removing heavy metal from contaminated soils.Batch experiments were performed to test the influence of tea-saponin concentration,pH and ionic strength on the removal efficiency.The results showed that the removal efficiency of heavy metals could be enhanced with the increase of the added tea-saponin concentrations.By adding 7% of tea-saponin,the removal efficiency of heavy metals in the tested soil samples can reach the maximum and could finally reach 96.36%,71.73%,43.71% and 20.56% for Cd,Zn,Pb and Cu respectively.The removal efficiency gradually decreased with the increase of pH values.The suitable pH scope should about 5.0.The ionic strength slightly had a negative influence on the removal efficiency of Zn,Cd,but no efforts on Pb,Cu.Comparing the transformation of heavy metals' chemical forms before and after tea-saponin treatment by BCR method,it was found that heavy metals in acetic acid extractable fraction are more easily to remove,the second is hydroxide-bound fraction,heavy metals in organically-bound fraction and residual fraction are difficult to remove.