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The transparency of fish ponds is an important indicator of the quality of fish ponds. Based on practical experience, the author explored a simple method for determining the transparency of fish ponds. Take one sheet of circular iron with a diameter of 30 cm, paint the black and white and four parallel ribbons on one side of the sheet metal, and wear a rope at the center of the sheet iron. During the measurement, the metal skin is vertically sunk in the water, and then the black and white bands are observed until the sinking stops when the black and white are not seen. The length of the rope below the water surface is measured and taken out to obtain transparency of the water body.