Starting from the rising and development of PBL teaching model, the author analyzes the procedures, characteristics of PBL teaching model, and the advantages of applying PBL teaching model in college English teaching. Due to the special advantages of the model, the author continues to explore how to apply PBL teaching model in college English teaching under the environment of network, and in order to guarantee the implement of PBL teaching model what should be done. Finally, the author comes to the conclusion that PBL teaching model is a brand-new teaching model that conforms to the reform of college English teaching and this teaching model can improve college English teaching. Therefore, this model should be popularized widely.