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Through wateranalysis of reclaimed water and surface water, the differences of reclaimed water and surface water used as complementary water of recycling cooling system are compared, furtherly we made static scale formation contrast test, through the extreme concentrating multiple, critical pHc, scale weight, SEM analysis, we can conclude that the scale formation rate of surface water is obviously faster than the reclaimed water, again through XRD crystallography and XRF composition analysis, we compared the differences of the scales, this result will provide important basis for controlling the scale formation of reclaimed water in industrial recycling cooling water system, and there are momentous significances to expanding the reusing of reclaimed water and saving water resources.