Using social network analysis, this paper explored three 93 *93 social networks and their relationships: an online network within a school term, two offline networks both before and after the term. We try to describe the holistic social configuration in the on-line and off-line world of campus e-learning, and explore the difference and influence between on-line and off-line worlds. Results show that: in the context of campus-kind of on-line learning, the structural features of on-line network, which is most different to offline network, including: weak ties, breakthrough the offline social boundary, and ”mainstream-centered & diversified border groups” configuration. Those structural features had significantly changed some aspects of the offline network, including: the supplement effect of offline weak information ties, compensating the online mainstream-centered dominance by intensify the offline cliques with stronger within group intimacy and interaction, and the weak transfer from online opinion leader to offline one.