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Research on the Impact of Innovation Ability on the Radiation and Leading Role of Regional Central City: Take the Beijing-Tianjin-Hebei urban agglomeration as an example

By constructing an innovation capability evaluation index system, we comprehensively measure the innovation capabilities of cities in Beijing- Tianjin-Hebei Urban Agglomeration. Based on the gravity model, breakpoint model and field intensity model, we analyze the impact of innovation capability on the radiation effect of the central city. The main conclusions are as follows: firstly, it is found that the innovation ability of each city in the urban agglomeration has been enhanced, and the regional collaborative innovation has been enhanced significantly. Secondly, the innovation radiation of Beijing has been promoted gradually, and the radiation scope has been strengthened continuously. The innovation ability has obvious positive promotion function to the radiation effect of Beijing.