The consolidated framework for implementation research (CFIR) is one of the most commonly used theoretical frameworks for implementation science. The updated CFIR was optimized based on the original version. The background, process and contents of the updated CFIR were introduced, and the domains and constructs of the updated CFIR were interpreted in this article. We analyzed the similarities and differences of the updated CFIR compared with the original CFIR, in order to provide methodological references for Chinese researchers to explore the determinants of implementation.