With the further development of the college English teaching reform,the web-based college English autonomous learning approach has been gradually established in colleges and universities across China.Studies indicate that the success of on-line English learners depends largely on their use of metacognition.Therefore,it is of great necessity to cultivate metacognition purposely among them.The cultivation of metacognition in the web-based autonomous learning environment falls into two parts: metacognitive knowledge cultivation and metacognitive strategy cultivation.And three chief approaches can be adopted for the cultivation: giving lectures,integrating metacognitive strategies into diverse on-line activities,and constructing the formative evaluation system.