Abstract: Bunsen beakers are adopted to the experiment. The resource water including manganese of the experiment is configured by manpower, then added with different quantity of potassium permanganate and coagulant, at different time of potassium permanganate. Manganese concentration of the above water is measured after coagulation and sedimentation on different conditions. The results indicate that, at the right adding time the removal rate of manganese is 90.6% -99.0%, when the equivalent proportion of potassium permanganate is 80% -100%; The nature organic matter has some effect on decreasing the removal of manganese.