Pot-cultured Pakehoi was used in this experiment to study forms and distribution of exogenous cadmium and lead in thin layer of black soil and their effects on pakehoi growth.The results showed that contents of all forms of cadmium and lead in soil increased with level of exogenous cadmium and lead.The lead and cadmium of exchangeable and Carbonate-bound form increased more than others.The proportion of lead and cadmium of exchangeable form and Carbonate-bound form increased as the added cadmium and lead increased,while cadmium of residual form reduced quickly.Fresh plant weight,leaf length and dry plant weight of pakehoi increased when the added cadmium was less than 2 mg/kg,and they reduced when the added lead was 5 mg/kg.When the added cadmium was 20 mg/kg,they reduced by 27%,28% and 21% compared with the control.Fresh plant weight,leaf length and dry plant weight of pakehoi decreased as the exogenous lead increased.When the added lead was 2000 mg/kg,they reduced by 43%,38% and 35% compared with the control.