Abstract: [Purpose/Significance] Under the background of the platform economy development, the information content governance in the network platform has become an important part of the national strategy. Building the framework and model of ecological collaborative governance of network information content is helpful to improve the comprehensive network governance system and create a purified cyberspace. [Design/Methodology] Based on the three-level coding procedures in the grounded theory method, 77 institutional documents from three levels of the government, industry organizations and platforms were coded, and 160 initial concepts, 31 categories, 10 sub-categories and 3 main categories were obtained. Combining with the content analysis method, this paper revealed the elements of network information content ecological structure and constructed a collaborative governance framework, and further explored the collaborative governance mode around the subjects collaborative relationship. [Findings/Conclusion] Network information content ecology includes three elements: governance objects, governance subjects, and governance activities; the government, industry organization, platform and users carry out governance activities in accordance with the three aspects of institution regulations, management work, and handling methods, and mainly carry out collaborative governance work in governance links such as "preventive governance, immediate governance, and result-oriented governance". [Originality/Value] Based on the institutional requirements at three levels, combined with the deconstruction analysis from the perspective of information ecology, this paper builds the network information content ecological collaborative governance framework and mode, reveals the operation mechanism of collaborative governance and insufficient, which enriches the theory system of network information content governance, and the optimization strategy can provide guidance for orderly practice of Internet information content management with Chinese characteristics.

Keywords: Content ecology, Internet platform, Content governance, Collaborative governance, Grounded theory