Abstract: In order to further explore the collaborative innovation of science and technology of the Beijing-Tianjin-Hebei, the bibliometrics, the Mann-Kendall trend test and the important point method are respectively used to study the cooperative characteristic of the Beijing-Tianjin-Hebei, including the number, density, influence and cooperation mode of the cooperative papers, based on the Beijing-Tianjin-Hebei cooperation paper data during 1979-2018 at the Web of Science information platform. The research results show that the Beijing-Tianjin-Hebei cooperation papers are mainly based on Beijing-Tianjin and Tianjin-Hebei from the perspective of the number of cooperative papers, showing significant polarization and stage characteristics. From the perspective of the density of cooperation papers, cooperative papers of Beijing are an important way of Tianjin and Hebei to publish papers, but publishing papers in cooperation with Tianjin and Hebei is only a very small part of Beijing. From the perspective of the impact of cooperative papers, the number of cited papers and impact factors of Beijing-Tianjin cooperation papers are higher than Beijing-Hebei and Tianjin-Hebei cooperation papers. From the perspective of cooperative papers, Beijing and Tianjin has a higher proportion of first author in cooperation papers than Hebei. According to the research results, the following conclusions can be drawn: the Beijing-Tianjin-Hebei science and technology collaborative innovation has achieved certain results, but it is still necessary to optimize the Beijing-Tianjin-Hebei science and technology collaborative innovation network. The full play is given to the driving role of Beijing and Tianjin in the development of science and technology innovation. The core competition force of Hebei in scientific and technological collaborative innovation should be gradually enhanced.

Key words: Beijing-Tianjin-Hebei, collaborative innovation in science and technology, cooperation on papers, Mann-Kendall trend test, important point method