BHMTPMPA is an effective threshold scale inhibitor for carbonate and sulfate scales. BHMTPMPA has good water-soluble properties and heat tolerance. BHMTPMPA has high calcium ion tolerance in a wide pH ranges and temperature as high as 120℃.When it is used for circulating water treatment, the concentration ratio of circulating water can be increased effectively, and the water consumption rate of circulating water can be reduced.