Abstract: In the process of solidly promoting Chinese-style modernization with high-quality development, it is necessary to adhere to the construction of digital China and to strengthen and expand the digital economy. The basic features of digital China include the fluidity of data elements, the versatility of digital technology, the inclusiveness of digital space and the universality of digital economy, which can promote the high-quality development of China's factor system, industrial structure system, national economic system and international trade system through four levels of innovation. To accelerate the construction of digital China and promote high-quality development, we need to deepen the reform of high-quality data factor market, accelerate the digital transformation of high-quality industries, focus on the cultivation of high-quality digital economy talents, and increase the opening-up of high-quality digital economy to the outside world. In order to promote Chinese modernization with high-quality development, the Party's leadership in the construction of digital China should always be the political platform; adhering to the people-centered approach in promoting the construction of digital China should be the value position; the "four directions" of science and technology development should be the important grasp; the institutional effectiveness of the new system should be the key support; and the construction of mutually beneficial and win-win international cooperation in the digital economy should be the positive initiative.