With the popularity of international communication and cooperation, the transformation from general English to general academic English has become an inevitable trend in college English teaching in China. The transformation poses challenges for college English teachers, including the lack of interdisciplinary knowledge, limited general academic English teaching ability and evaluation ability. Accordingly, various measures can be taken to deal with the challenges, such as expanding the interdisciplinary knowledge, establishing the teaching community and reforming the evaluation means. These strategies are intended to construct the harmonious education ecology in college to promote the transformation and development of college English teachers.