Based on the questionnaires and interviews on 19 college English teachers of a university in Beijing, the paper discusses college English teachers＇ beliefs. Through the analysis of research results, the paper focuses on the following questions： （1） What are the core beliefs of college English teachers？ （2） What influence will the teachers＇ beliefs exert on teaching behaviors？ （3） Will the teachers＇ beliefs change？ If the answer is YES, how will they change and what is the source of the changes？ The exploratory results and findings can help college English teachers realize the importance of teachers＇ beliefs, through which can help them improve their teaching practices and foster their professional development.
