This paper reports on the effects an experimental English as a Foreign Language (EFL) program in Second Life (SL) had on Chinese student EFL learning. The study took an evaluative approach using quasi-experimental design with participants from one Chinese university and one American university in the southeastern United States. Results indicated significant main effects between a control group and the SL group on EFL measures, as well as significant gains in total score and several subcomponents between pre-test and post test. Further analysis using a post study survey, students' blog posting, and interview transcripts revealed that the SL_EFL Program had a positive impact on students' EFL learning.