Abstract: Quantum technology will play an important role in the future social and economic development. EU launched the Quantum Technologies Flagship and proposed the Strategic Research Agenda on Quantum technologies , to accelerated the commercial application of quantum research. In this paper, we analyze development process of the EU Quantum Flagship, the challenges and roadmaps of four application fields, scientific and technological resources and innovation ecosystem, to reveal the development strategy of EU quantum technology. First, the development of Quantum Flagship is summarized. Second, the challenges and roadmaps of four application fields, including communication, computing, simulation, sensing and metrology, are analyzed. Third, we analyze the scientific resources and technological resources that support the implementation of Quantum Flagship. Then, we analyze the challenges and measures of the EU to create an innovation ecosystem from four aspects, which are defining the use cases and requirement specifications of quantum technology, providing infrastructure and supply chain, promoting the development of new products and services, education and training. Finally, we propose suggestions for the development of quantum technology in China, including creating roadmaps of quantum technology, optimizing scientific and technological resources, creating an innovation ecosystem, accelerating the commercial application of quantum technology, speeding up the definition of quantum communication standards, and developing the education and training. 

Key words: EU Quantum Technologies Flagship, Roadmap, Scientific and Technological Resources, Innovation Ecosystem