First, the use and performance of environmentally friendly corrosion inhibitor compound HX-904 is composed of an epoxy succinic acid, phosphorus acid, and other organic compound is made with excellent scale and corrosion inhibition performance, low phosphorus, low nitrogen for new environmentally friendly products can be widely used in circulating cooling water systems, sewage treatment, desalination, gas scrubbing, boiler water treatment systems. Environmentally friendly corrosion inhibitor compound HX-904 at high hardness, high PH value of water systems scale effect is prominent, is a new low phosphorus, low nitrogen product, easy to breed bacteria and algae, low dosage, high cost, which can effectively lower operating costs. Second, the quality index Item Index PH value (1% solution) ≤ 6.0 Solid content% ≥ 23 Density g/cm3 ≥ 1.07 Total Phosphorus (as PO43-) ≤ 7.0 Third, the use of this product can be added directly to the water system general dosing concentration of 10-25ppm (calculated by fill water), can also be provided dosing according to our plan. Fourth, packaging and storage of environmentally friendly corrosion inhibitor compound HX-904 plastic drum, 25kg / drum or 200kg / barrel, according to user needs; Store in a cool dry place, storage period of twelve months. Fifth, security environmentally friendly corrosion inhibitor compound HX-904 toxic side effects, such as the case of skin contact, can be water or soapy water rinse.