Abstract: Health and medical big data is an important basic strategic resource of the country，and primary liver cancer big data（PLCBD）is the key to improve the diagnosis and treatment of primary liver cancer（PLC）and achieve precise prevention and treatment of PLC.Standard terminology is the foundation of information sharing and business collaboration between heterogeneous systems in open sharing environment，and is also the important basis for effective data fusion of multi centers.However，there is no systematic terminology related to PLC.In order to standardize the construction of big data of primary liver cancer，relevant experts of the Chinese Chapter of the International Hepato-Pancreato-Biliary Association and Big Data Alliance for Liver Disease and Liver Cancer were organized to formulate the Clinical Standard Terminology of Primary Liver Cancer，aiming to improve the data quality and promote multi-center data fusion.

Key words: primary liver cancer, big data, medical terminology