With the rapid development of digital information technology, the internet has become an important platform for communication and learning. Against this backdrop, online language communication skills have attracted increasing attention. This study first introduces the communicative language proficiency framework outlined in the Common European Framework of Reference for Languages (CEFR) and summarizes the latest online interaction language proficiency scale and illustrative descriptors provided in the newly released CEFR Companion Volume (CEFR CV). Furthermore, employing a mixed research methodology, this study delves into the analysis of scenario-based communicative activities in the Irodori series of Japanese textbooks, which systematically cultivate learners’ online language usage abilities. The aim is to explore the correlation between these textbooks and the descriptors. The findings of this research offer valuable insights for future endeavors aimed at enhancing online language proficiency based on textbook learning activities design.