Abstract：［Purpose/significance］Open government data contains huge production value and creation potential. It is of practical significance to summarize the value structure and formation process of government open data and analyze the value-added mechanism for promoting the further development of the utilization of open government data in China.［Method/process］First of all, through literature research on the value formation and formation of open government data, the value formation link is obtained. Secondly, the value-added process and value-added link are analyzed, and the value-added transmission process is further explored. Thirdly, the value-added model of open government data is constructed based on the value chain theory. Finally, the value-added mechanism is analyzed according to the model.[Result/conclusion］Eight mechanisms of value-added of open government data are put forward: demand triggering mechnism, efficiency enhancing mechanism, sharing stimulating mechanism, benefit driving mechanism, policy leading mechanism, capital synergy mechanism, technology enabling mechanism and efficiency agglomeration mechanism.