The research investigates undergraduates' English abilities of autonomous learning in the environment of ecological affordance. It proves that their abilities are significantly different before and after independent learning in one semester, and they can actively try their own learning strategies and achieve good results in English learning, which reflects the success of cultivating the ability of autonomous learning. And it also holds that it is a good ecological affordance when learners could sense and understand abundant learning resources under their teachers' effective guidance, and thus arouse enough enthusiasm for English learning to guarantee the quality of College English instruction.