Based on the leakage mechanism of heavy metal contaminants

a mathematic model is developed for describing the transportation and transformation of heavy metal contaminants in a heterogeneous aquifer.Taking leaching element Hg as an example

the approach has been used for the simulation of groundwater flow and contaminant transport.It predicts the temporal and spatial distribution features of contaminant concentration.Numerical simulation results show that under certain leakage conditions

the groundwater pollution caused by heavy metal contaminant increase with time

while within the low K zone

the contour of contaminants concentration becomes tend to broken with slow increase of concentration.The present model provides scientific basis for making decision in selecting the disposal site and controling and preventing pollution.