Pronunciation accuracy has always been an important goal in teaching English as a second language. However, the recent phonetic changes among English varieties often make it difficult for conventional methods of teaching English as a second language to achieve the goal. This paper focused on the phenomenon of GOOSE fronting as a typical example of vowel change in English. After reviewing previous studies on GOOSE fronting, this paper attempted to discuss the distribution of GOOSE fronting among Chinese students and the possible influencing factors, using a combination of quantitative and qualitative methods. The findings of this paper suggested that the classroom may have a minor impact on the acquisition of second language phonetic details, while the input of the language environment may be considered as a crucial contributing factor.