Abstract: The ecological effects of copper，zinc and cadmium on the inhibition of seed germination and root elongation of Eucalyptus dunnii，Eucalyptus benthamii，Eucalyptus grandis，Eucalyptus labill were studied in this paper in 20 days of the trial period．Results indicated that the inhibition effects of heavy metals on seed germination and root elongation were all obvious in each concentration of heavy metals，heavy metals decreased the rate of seed germination，but these are the eucalyptus seed germination process less affected. And also，the result indicated that eucalyptus in the four tests designed by three kinds of heavy metals Cu，Zn，Cd than in the three show they are more sensitive to the Cu．In addition， the regression relationships between heavy metal concentration and the inhibition rates of seed germination and root elongation of Eucalyptus were remarkable，eucalyptus seed more sensitive to heavy metal pollution，inhibition of root elongation generally reach 100 percent，significantly higher than inhibit seed germination rate．