Purpose/Significance] Difficulties in G to C services and absurd certificates are the hot topics nowadays. According to the policy published by the State Council (Guobanfa﹝2015﹞No. 86) , the solution should be sharing information between government agen-cies. So itˊs necessary to study how to share. [ Method/Process] In this study, all the 465 items of online services on Shanghai govern-ment portal website were analyzed one by one to distinguish the source of each necessary material. In this way, the patterns of information flows between government agencies were discovered and three diagrams of co-occurrence network were drawn in order to illustrate the characteristics of government information sharing network. [ Result/Conclusion] Then, conclusions were drawn that the government infor-mation sharing needs to follow the steps: certificating personal identity online; certificating identities of corporates and other entities on-line;sharing information inside ministry of public security; sharing information between the government agencies of public security, health, social security, education, industry&commerce, housing management and civil administration;sharing information across regions. Finally, four limits of this paper were discussed.%[目的/意义]办证难、奇葩证明是广受社会关注的民生问题，国务院发布的《关于简化优化公共服务流程方便基层群众办事创业的通知》明确指出通过政府部门间信息共享来解决问题，因此如何共享需要深入研究。[方法/过程]对“中国上海”市政府门户网站上全部465项“市民办事”项目进行逐条梳理，分析所有证明材料的来源，厘清政府部门间信息流分布规律，进而通过社会网络分析软件构建政府部门共现网络图进行分析，说明基于信息共享的政府单位共现网络的特点。[结果/结论]为实现市民个人全程网上办事，政府信息共享的合理路径是：个人身份网上认证———企事业单位信息共享———公安部门内部信息共享———公安、卫计、人社、教育、工商、房管、民政部门间的信息共享———跨部门跨地区信息共享。最后说明了研究存在的4个方面的局限。
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