Nowadays, in China, English is regarded as a foreign language and college English courses are offered in nearly all the colleges and universities. However, teaching English in colleges inevitably exists some problems. During the teaching process, teachers mainly occupies the dominant position and students are short of communication with teachers and among students themselves, and part of teaching content is out of date and exercises are stereotyped, which lead to the imbalance in foreign language classroom ecology. Therefore, based on the perspective of eco-linguistics, the paper aims to explore strategies in college English teaching in order to build the ecological and harmonious college English classroom.