Three types surface soil from Datong coal mine subsidence in Huainan City of Anhui Province were collected for remediation evaluation. Sample A was from the control area with a mixture plantation

sample B was taken from an area with chemical waste filling

and sample C was taken from an area with coal gangue fillin. The physical and chemical properties

and the occurrence characteristics of Cr

Cd

Cu

Pb

and Hg of the samples were analyzed

and the environmental effects of the soil restoration were assessed. The results showed as follows:First

in the three samples

available P content in area A >area B >area C

but available N in area C >area A >area B

and content of heavy metals and exchangeable Na+ of area B was higher than in other areas

and in particular

the ESP(exchange sodium percentage) content was up to 22%; Second

high alkalinity of the filling soil was widespread

showing a serious lack of available N and P. The soil fertility in area A >area C >area B. Third

the levels of heavy metal pollution found in the soil showed that area A reached slight levels

area B reached moderate to high levels

and area C reached different types of heavy metal pollution. The total content of Cr

Cd

Cu and Pb in the soil was

to different degrees

greater than that found in typical Huainan City background values; Fourth

the effect of the soil restoration in subsidence sample C was superior to subsidence sample B

and the environmental problems of the soil in area B was severe

it should be improved promptly.