Abstract: The paper uses UCINET to analyze the network density, structure, and centrality of Sky Online Classroom of Putian University. It finds that: the structure of the whole network is loose, the interaction between members is less, the teacher occupies the important position in the community, and knowledge sharing between students is rather limited. To solve these problems, it puts forward the emphasis on the application of virtual learning community and module function construction, guide students to actively participate in community interaction, effective knowledge contribution to improve knowledge sharing.