Introduction  Many foreign projects need to adopt American standards for design, and many engineers are not familiar with these.

  Method  In order to facilitate the relevant engineer involving in foreign projects to quickly understand the differences between Chinese and American standards in the design of disinfection facilities in water treatment plant and provide a more reasonable design, this paper described in detail the Chinese and American standards for the design of disinfection facilities in water treatment plant, and made a detailed comparison of the chlorine dosage, dosing point, disinfection index and electro-chlorination system′s setting.

  Result  The comparison results show that compared with the Chinese standard, the American Standard has a relatively wide range of dosage, high require-ments for salt quality, salt storage capacity, sodium hypochlorite storage tank capacity and flexible configuration of chlorine generation system.

  Conclusion  This paper aims to provide some guidance and reference for American Standard Design Engineering in the future.