First, the use and performance of the composite corrosion inhibitor HX-903 containing organic phosphates, sulfonic acid group, carboxyl group, hydrolysis multiple copolymer poly horse, knot to efficiently prevent the deposition of calcium, magnesium and silicate materials dirt. Slow down the pipe, heat transfer equipment corrosion, stable hydrolysis or degradation of performance can not easily be applied to the Yellow River water, surface water, and other water circulating cooling water system. Composite corrosion inhibitor HX-903 water quality conditions required width can be widely applied to different areas of water quality, low inorganic phosphorus content, easy to control bacteria and algae slime production, corrosion and scale effect is prominent, can greatly extend the exchange the life of the thermal equipment. Second, the quality index Item Index phosphate (PO43-) content%> 5.0 phosphite (PO33-meter) content% ≤ 0.30 azoles (to C6H4NHN = N) content% ≥ 0.80 PH (1% aqueous solution) 3.50 ± 1.00 Solid content% ≥ 20 Density (20 ℃) ??g/cm3 ≥ 1.10 Third, use the drug directly into the sump, the dosage according to total phosphorus in water 4 ~ 5ppm. Fourth, packaging and storage of complex corrosion inhibitor HX-903 plastic drum, 25kg / drum or 200kg / barrel, according to user needs; Store in a cool dry place, storage period of twelve months. Fifth, security complex corrosion inhibitor HX-903 no significant stimulation of the skin, such as contact with skin, wash immediately with soap and water or water can.