ATMPNa4 is the salt of ATMP, it can inhibit the scale formation, calcium carbonate in particular, in water system. ATMPNa4 can be used in circulating cool system in power plant, oil refinery plant and oilfield refill water system. ATMPNa4 has good synergistic effects with other additives, in neutral to acidic condition, no ammonia smell is let off. ATMPNa4 is used together with other organophosphonic acid, polycarboxylic acid or salt to form organic alkaline agents, it is used in circulating cool water system for all water quality.