| The environmental risk assessment for Paishanlou gold mine in Liaoning was studied in this paper. The risk recognition to the gold mine had been carried out from the material risk and the engineering project risk. The cyanide polluting groundwater had been selected as the maximum credible accident by Analytic Hierarchy Process. Then by the method combined the data frequency analysis with the event tree analysis, the maximum credible accident had been analyzed quantitatively. Subsequently the mathematical model had been established according to the curtain scenery supposition of the cyanide pollution ground water. The results computed by Matlab indicated that the concentration of cyanide caused rainfall surpass III kind of quality standards of the ground water. The measures against infiltrate deal mainly with the rainfall taked place once a year. Finally according to the risk assessment about the influence of cyanide discharged on aquatic lives and human health, it was reached that the cyanide contaminating groundwater belong to acceptable risk. As cyanide is highly toxic substances and there are many uncertain factors in the evaluation, therefore it is very necessary to strengthen risk management.
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