• The current state of the pond: across the pond has three sewer. Sources of water in the Lake is primarily for rain water, wastewater from the library, cafeteria, and groundwater through the pump; There is no way the water out.• Pond water, the concentration of pollutants is hardly changed in a long time. Pond water is generally relatively stable, homogeneous in all locations. So just use the simple method to sample. Pond water depth small so just took a representative sample in each sampling point.• Experimental Groups were divided into 3 groups of small order charge of sampling and sample analysis in 3 different locations on the Lake. The location is marked according to the diagram:
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