This article reports an action research, conducted in an undergraduate course, Second Language Acquisition and Development, in a 3-way blended learning (BL) environment—face-to-face (F2F), an online learning system (eLearning), and Second Life (SL). The study was the result of a joint project between a university in America and one in Hong Kong. Data collected from the American students were included in this study. The purposes of this action research is to: 1) monitor BL course and provide suggestions for future courses, and 2) investigate if students’ time spent in eLearning and the number of discussion posts impact students’ achievement. This action research provides suggestions for improving application of 3-way BL in future courses in terms of course design, instructor preparation and online grading.