This report made systematic study on the connotation and characteristics of digital economy from theoretical level. It is found that the traditional location theory and governance theory is difficult to meet the needs of the development of the digital age. In the process of combining the characteristics of digital economy with the new national development concept and major strategic layout，as well as the actual needs of key areas in the coordinated development of Beijing，Tianjin and Hebei，we find the specific application scenarios of digital economy in the coordinated development of Beijing，Tianjin and Hebei. By analyzing the application progress and trend of digital economy in beijing-Tianjin-Hebei coordinated development，it is found that the spatial development equilibrium level of digital economy in Beijing-Tianjin-Hebei urban agglomeration is lower than that in Yangtze River Delta and Pearl River Delta urban agglomeration. Technological progress promotes the innovation efficiency of digital economy in Beijing and Tianjin，and technological improvement has became the main way to improve the innovation and development efficiency of digital economy in Hebei Province. The promotion and application of digital economy play a significant role in promoting carbon emission reduction in Beijing-Tianjin-Hebei cities. The Internet platform plays a significant role in promoting the consumption level of residents in Beijing，Tianjin and Hebei. The Internet production service platform in some areas of Beijing，Tianjin and Hebei has already had a certain scale，which plays a significant role in promoting the total factor productivity of regional industrial development. Beijing，Tianjin and Hebei have successively established big data management departments and set up corresponding online government service platforms. At the same time，from the perspective of problem finding，it is found that the digital development gap in some fields have effects on the construction of digital coordinated development pattern of Beijing-Tianjin-Hebei urban agglomeration. The technological achievements of digital economy in urban agglomeration are concentrated in Beijing，but the spatial spillover effect is not significant. The Internet platform in most cities of Hebei province has not yet formed scale effect. The Beijing-Tianjin-Hebei urban agglomeration has not formed an obvious spatial development pattern for openning and sharing of government data. Based on this，it is proposed that the digital city construction should be utilized to narrow the digital development gap between regions and provide effective support for the construction of “2+11” coordinated development pattern of beijing-Tianjin-Hebei digital city. Give full play to Beijing’s platform advantages and technological innovation advantages，and continue to deliver innovation momentum for digital economy development in Tianjin and Hebei. Explore the digital economy potential of Hebei province around the advantages of the field to provide an enabling platform for the high-quality development of the industry. To promote the progress of the construction of the government data opening platform in Beijing，Tianjin and Hebei.