Abstract: The paper elaborates, from the viewpoint of environment protection, the harms of the mining pit waste water discharge and the importance and necessity of waste water treatment at Tonglushan Mine.An optimal water treatment approach is selected through comparison and analysis.This approach takes full consideration into the relation of the long-term and the short-term, and the partial and the integrated, makes well use of the current facilities to save the construction investment, and adopts the developed skills and scientific researches to ensure the quality of water treatment and lower the operation costs.The implementation of the optimal treatment and utilization project has achieved remarkable effects; the utilization rate of waste water improved, the environmental pollution reduced, and the production costs lowered.The project realizes comprehensive environment, society and economic benefits, then taking an essential step in building the Zero-discharging mine.

Key words: Waste water, Treatment, Utilization, Environment protection, Benefit