The risk assessment system of tailings pond water pollution takes the engineering data, the environmental data and the incident material as the foundation. Firstly, it is necessary to prepare tailings materials, indentify the main risky substances and establish the potentially hazardous process. The grade of evaluation is determined by the risk of substances, the result of identification of major hazardous sources and the sensitivity of environment. The evaluation range depends on various

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... emission. Then, with the overstandard concentration risk, the system reveals directly the the maximum credible risk. It synthesizes the groundwater intrinsic vulnerability, the pollution load risk and the pollution harmfulness to assess the tailings pond water pollution qualitatively, and raise corresponding assessment standard and risk management combining prevention with emergency measures. Generally, the risk assessment is the improvement and perfection of the existing qualitative methods. Based on this index system, the risk levels of water pollution are divided into five classes, which make qualitative and quantitative risk assessment a reality. The results of this research provide theoretical basis and scientific evidence for preventing, monitoring, controlling of tailings pond water pollution.