With the rapid development of informationalization of higher education, information technology is changing student's way of learning at an alarming rate. Diigo is an emerging social software developed withWeb2.0 as the platform. It is endowed with the powerful functions of online bookmark, e-tagging, roup forum, resource searching. Besides, it is easy to operate and it is conductive to create a learning environment for the cooperation and interaction between teacher and students. This paper makes a brief introduction of Diigo and tries to apply Diigo to teaching, explore its impact and application of web-based collaborative learning.