In this paper,the relationship between Zn,Pb and the activity of the POD,SOD and CAT enzymes within the roots and leaves of Carex gentiles Franch.was examined.This was done through potted plant experiments carried out in the diurnal growth incubator.The results demonstrate a greater amount of SOD activity with increasing amounts of Zn and Pb within the leaves of the plant.In the roots,however,SOD activity fluctuated with increased amounts of Zn and Pb and the combination of them increased the activity of SOD in the roots and leaves.This suggests a positive relationship between SOD activity and zinc concentration.The best activity of SOD were 201.8 U/gFW and 233.1 U/gFW respectively.In the analysis of the POD enzyme,the greatest activity was found in the roots and activity in the leaves was found to fluctuate with the increase of Pb or Zn.With the increase of Pb and Zn,the activity of POD in the roots and leaves increased most.The best activity of POD were contrast group's 7.47 times and 1.49 times.The activity of CAT was found to be inhibited differently by the treat of Pb or Zn,suggesting a negative relationship between CAT activity and zinc concentration.The analysis of variance demonstrate that Pb has the greatest influence on the SOD,POD and CAT within the roots;Zn,on POD in the leaves and the combination of Pb and Zn,on the POD in the body and the SOD in the roots.In general,under the pressure of Pb,Zn or the combination of them,especially under the high pressure of Pb,SOD and POD worked mainly.It is possible that Carex gentiles Franch.is a new source of repairing the forest in west China areas polluted by Pb and Zn.