Taking the course Cross‑Border E‑Commerce for Business English majors at Yangtze University College of Arts and Sciences as an example and adopting project‑based teaching as the theoretical foundation, this study implements online‑offline blended teaching centered on the product‑release project with two digital platforms, namely Zhongyu Wisdom Platform and Yixue Cloud Platform, and constructs a diversified formative evaluation system. Teaching practice indicates that blended teaching supported by digital platforms can integrate language training with cross‑border e‑commerce practical operations. Students obtain satisfactory overall learning outcomes, and their professional practical capabilities and teamwork competence are effectively improved. This research can offer references for the teaching reform of similar courses.