By using the method of social network analysis, the paper screens 182 valid nets out of health in AlexaTop200, 2015 Comprehensive Hospital Evaluation List by Fudan University and nets of associations in the medical field, and divides them into 5 subgroups by the nature of nets sponsors, namely enterprises, individuals, professional institutions, social organizations and governments. Based on the link relations among these nets, it builds the diagram of network relationship between the whole nets and the subgroups, compares and analyzes the network structure, centrality and network relevance of the whole nets and the subgroups, and finds out the similarities and differences of different types of nets in the size and structure and the influence differences of different nets. It provides reference for the development of public health nets and the improvement of current health information services.