Objective,2,To evaluate the implementation effect of the national standard—,Classification and Codes of Diseases and Patterns of Traditional Chinese Medicine, （GB/T 15657—2021）—in China and discuss the problems in its implementation for the purpose of providing technical basis and suggestions for further promoting the implementation of the standard.,Methods,2,A questionnaire survey was conducted from November to December 2021 on the implementation， application， and training of the new national standard—,Classification and Codes of Diseases and Patterns of Traditional Chinese Medicine, （GB/T 15657—2021）—in the TCM institutions of 27 provinces and municipalities directly under the central government， including Shanghai， Jiangsu， and Zhejiang. Literature analysis was also performed.,Results,2,In this survey， 834 questionnaires were distributed and 834 valid questionnaires were returned， covering 242 hospitals in China， among which 73.02% were tertiary hospitals and 26.02% were secondary hospitals. According to the survey， 95.80% of the respondents reported that their hospitals had started to use the standard； 81.18% of the respondents believed that the terminology of the standard was more practical； 79.86% of the respondents thought that the classification of this standard was more practical； 84.65% of the respondents held that the doctors’ diagnosis had become more standard and accurate since the implementation of this standard； and 88.25% of the respondents believed that this edition of the standard met the needs of clinical diagnosis. By December 2021， National Administration of Traditional Chinese Medicine， National Health Commission of the People’s Republic of China， and National Healthcare Security Administration had all issued a document to announce the use of ,Classification and Codes of Diseases and Patterns of Traditional Chinese Medicine, （GB/T 15657—2021）.,Conclusion,2,Classification and Codes of Diseases and Patterns of Traditional Chinese Medicine, （GB/T 15657—2021） has reasonable classification criteria and scientific terminology， which transits smoothly from the previous edition， and its implementation facilitates doctors to make more standard and accurate diagnosis. It is recommended to further improve the system construction of the new edition of the standard in terms of publicity and implementation， monitoring and evaluation， and feedback mechanism.