This paper has studied the idea that Beijing promotes “Big Science Popularization” based on Communication theory，from the multiple dimensions such as Science Popularization subjects，resources，content，method and effect etc. Firstly，the idea of Science Popularization has been defined and the concept of “Big Science Popularization” has been explained up-to-date. Secondly，it has been analyzed that the fusion idea that Science Popularization work in Beijing should follow in accordance with the relevant policy. Thirdly，the innovations of Fusion Science Popularization Idea in Beijing has been be excavated by analyzing innovation practices of Science Popularization work in recent years（especially typical cases）. At last，we puts forward some suggestions for the development in the future in the light of the new demand.