Objective,2,To interpret the differences in the compilation methods and content of the part of syndromes between the old and new editions of Traditional Chinese Medicine (TCM) National Standards for the purpose of promoting the application of the new editions of TCM National Standards.,Methods,2,Relational mappings of TCM syndrome terms in the new and old TCM National Standards were compiled for the statistical analysis and text comparison of the coding mode, naming standard, compilation style, inclusion scope, classification system and definition format.,Results,2,①In terms of coding mode, the old editions of TCM National Standards had 6 digits at maximum while the new editions expanded the coding capacity by changing the coding system into no definite length in digits which made the hierarchical order in the new editions more obvious, and with the dot at the end of the code the categories of syndromes were clearly identified. ②In terms of naming standard, the new editions of TCM National Standards completely abandoned the naming method of syndromes with punctuations used in the old editions and uniformly adopted the rule of one term corresponding to one meaning. ③In terms of compilation style, the new editions of TCM National Standards added optional words, taking into account the usage conventions of syndrome terms in different regions. ④In terms of collection scope, the new editions of TCM National Standards integrated ,Classification and Codes of Diseases and Patterns of Traditional Chinese Medicine, (GB/T 15657—1995) and ,Clinic Terminology of Traditional Chinese Medical Diagnosis and Treatment,-,Part, 2: ,Syndromes,/,Patterns, (GB/T 16751.2—1997) by merging the same terms, adjusting the categories of terms according to the classification system in the new editions, supplementing definitions, and removing or adding new terms. Finally, 2,060 syndrome terms were included.⑤In terms of classification system, the new editions of TCM National Standards referred to the classification system in the 11th revision of ,International Statistical Classification of Diseases and Related Health Problems, (ICD-11) issued by World Health Organization and further integrated the corresponding classification system in the old editions. ⑥In terms of definition format, the new editions of TCM National Standards formulated a detailed and unified definition format and specifications for TCM syndrome terms, and defined the connotation and application scenarios of the included syndrome terms according to the definition specifications.,Conclusion,2,Compared with the old editions, the new editions of TCM National Standards can better satisfy the contemporary demands for the standardization and internationalization of medical informatics in China in terms of coding method, naming standard, compilation style, inclusion scope, classification system and definition format of syndrome terms.