From the 1930s until the 1970s, in the world in succession in appeared many serious pollution incident, cause acute poisoning death, people are very serious consequences, so people to sudden accident harm caused by the evaluation of environmental problems and concerns rise gradually. Taking fuxin row mountain building as an example, the paper gold deposits potential risk risk , from the material and project risk potential risk to the two aspects of gold on risk identification, then USES ahp to those of groundwater pollution cyanide wastewater is the largest credible accident. Finally using frequency analysis data and event tree analysis method of combining the most credible accident to quantitative analysis. Because of this, the study of bearing cyanide wastewater in the rainy season and influence to environment, water leakage in rainy season leaching of groundwater. But after all is poisonous substances, cyanide and evaluation process exists many uncertain factors, thus reduce the content of cyanide tailings bread, strengthening open pit mining pit and the prevention measures in dry yard to use fixed number of year of tailings immediately after covering afforest is very necessary.