Effects of Pb²⁺ on the growth of mung bean ( Phaseolus radiatus L.) seedlings were conducted with an experiment. The results showed that the dry weight of roots increased by 13.01 %, the dry weight of shoots decreased by 12.80 %, the free proline and MDA content in leaves increased specially by 2 .07% and 5 .82%, the activity of POD decreased by 37.32% compared to control under 0.05 mmol /L Pb^{2 +} treatment .Under 0.5 mmol/ L Pb^{2 +} treatment, the dry weights of roots and shoots decreased specially by 14.45% and 29.36 %, the free proline and MDA content in leaves increased specially by 43 .55 % and 28.50%, the activity of POD decreased by 59.37% compared to control. The results indicated that Pb²⁺ interfered the growth of mung bean seedlings by destroying cell membrane intergrity and decreasing the activity of POD in leaves.