ISO9001 is an international standard issued and implemented by the International Organization for Standardization (ISO), serving as the basis for Quality management system certification.

The ISO9000 family of standards scientifically summarizes internationally advanced quality management theories and practical experiences, reflects the basic laws of quality management, and is applicable to organizations of various types and sizes. It is of great significance for strengthening the "rule of law" within organizations, achieving intensive management, and improving and enhancing competitive strength.

Note: For engineering construction enterprises, certification should be conducted in accordance with both ISO9001 and GB/T50430 "Code for Quality Management of Engineering Construction Enterprises". The GB/T50430-2017 version of "Code for Quality Management of Engineering Construction Enterprises" was officially published on October 30, 2017, and officially implemented on January 1, 2018.