To control the testing process,improve the testing level and continuously improve the laboratory quality management system,the non-conformities are summarized in the internal and external audit of T Lab from 2019 to 2022,understanding the existing problems in the operation of quality management system mainly related equipment,facilities and environmental conditions,externally provided products and services,review of requests,tenders and contract,continuing.The reasons are analyzed deeply,putting forward the countermeasures and suggestions.