Abstract: Study was carried out by hydroponic culture, the result showed that the root morphology of three kinds of vegetable was promoted when Lead concentration less than 1mg/L, with the increasing of the treatment concentration, Pb toxicity to vegetable crop gradually showed, and resulted in the inhibition of roots development. Root tip became black, the number of lateral root and root hair decreased, radical length，root surface area，root volume decreased, leafs became yellow and easily fell off.