As pointed out in the Report to the 20th National Congress of the Communist Party of China (CPC), the next five years (2022–2027) will be crucial for beginning to build a modern socialist country in all respects. Firstly, the next five years will be a period of historical transition in the central task of the CPC. The central task of the CPC will be to realize the Second Centenary Goal of building China into a great modern socialist country in all respects. At this crucial stage for getting our efforts off to a good start, China should understand and pursue the Five-Sphere Integrated Plan to advance the rejuvenation of the Chinese nation on all fronts through a Chinese path to modernization. Secondly, the next five years will be a period of deep reform in which strategic opportunities, risks and challenges are concurrent. Alongside a new round of scientific and technological revolution and industrial transformation well underway, the new principal contradiction facing Chinese society, a historical transition in the central task of the CPC, and a shift in the international balance of power, profound and complex changes are taking place in China’s internal and external environment for development. Uncertainties and unforeseen factors are rising and must be dealt with appropriately. Thirdly, the next five years will be a key period of achieving China’s overall development objectives for 2035. It is a paramount stage of meeting the 14th Five-Year Plan goals, formulating the 15th Five-Year Plan goals, and realizing Chinese modernization by 2035. China should uphold the CPC’s overall leadership, follow the path of socialism with Chinese characteristics, apply a people-centered development philosophy, remain committed to deepening reform and opening up, and carry forward our fighting spirit. Fourthly, the next five years will be a crucial period of accelerating the creation of a new pattern of development and pursuing high-quality development. Chinese modernization should be advanced through a series of strategic initiatives, such as building a high-standard socialist market economy, modernizing the industrial system, propelling rural revitalization across the board, promoting coordinated regional development, and boosting high-standard opening up. Fifthly, the next five years will be an impact period of unprecedented downward pressure on the national economy under various factors and risks beating expectations. In order to achieve the 14th Five-Year Plan goals and the overall development objectives by 2035, it is necessary to defuse the threefold pressure composed of increasing demand shrinkage, supply shocks and flagging market expectations, as well as intensifying potential risks. To accomplish the main objectives and tasks for the next five years, it is necessary to observe objective laws, apply the new development philosophy, continue to pursue economic development as central task, adopt system-based thinking, take steady steps to sustain progress, and promote high-quality development in a scientific and effective manner.

Advancing and expanding Chinese modernization is an inherent requirement and fundamental guarantee for building a great modern socialist country in all respects and realizing the great rejuvenation of the Chinese nation. By systematically grasping the logical clue of advancing and expanding Chinese modernization, and realizing the great rejuvenation of the Chinese nation, from the perspectives of theoretical implication, historical evolution, and practical position, the Communist Party of China (CPC) can clarify the direction and goals of advancing and expanding Chinese modernization, and deepen our understanding of the world modernization path based on advancing people-centered modernization in all respects by putting the people first, highlighting distinctive advantages of Chinese modernization by standing on Chinese own feet, and adhering to peaceful development, and analyze the underlying value concepts for advancing and expanding Chinese modernization. In terms of practical approach, Chinese modernization can be advanced in a stable and far-reaching manner, and new glories can be created only by further strengthening the guidance of the Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era on Chinese modernization, upholding and enhancing the CPC’s overall leadership in the whole process of Chinese modernization, promoting high-quality economic and social development to empower and strengthen the foundation of the stability and success of Chinese modernization, and actively seizing the strategic opportunity to advance Chinese modernization under the great changes unseen in a century, so that a solid inherent impetus and a supporting guarantee for the construction of a great modern socialist country in all aspects and the realization of the great rejuvenation of the Chinese nation can be provided.

Small and medium-sized enterprises (SMEs) are key contributors to technological innovation. As China’s vanguard for self-reliance and strength in science and technology, specialized, sophisticated, distinctive and novel (SSDN) SMEs have grown into an important motivation for high-quality development, a key stabilizer for the new development paradigm, and a vital force for an innovation-driven China. In recent years, China has been ramping up support for SSDN SMEs, and raised the focus on their development to a new level. At present, some problems and obstacles are befalling the high-quality development of SSDN SMEs, such as imperfect innovation system and mechanism, weak basic research service capabilities, a digital divide in digital transformation, and insufficient vitality of collaboration among players in the innovation ecosystem. In the future, China should promote the high-quality development of SSDN SMEs from system and mechanism, basic input, business environment, and digital empowerment. Specifically, China should increase policy support to consolidate the institutional guarantee for innovative development, build more platforms to form a dynamic innovation ecology, enhance intellectual property protection to spur entrepreneurship, and ramp up upgrading and transformation for the quality and efficiency improvement of traditional enterprises.

Sci-tech innovation is an important measure for the Guangdong–Hong Kong–Macao Greater Bay Area to achieve high-quality economic development. Theoretically, there is a coupling coordination relationship between sci-tech innovation and high-quality economic development, and coordinating the relationship between the two is beneficial to building the Guangdong–Hong Kong–Macao Greater Bay Area into an international innovation and technology hub and promoting high-quality economic development. At present, the Guangdong–Hong Kong–Macao Greater Bay Area has seen a year-on-year increase in both the level of sci-tech innovation and the level of high-quality economic development, with a sound development trend. Its coupling coordination degree between sci-tech innovation and high-quality economic development has steadily improved from a slightly uncoordinated stage to a primarily coordinated stage, but the overall degree of coordination is still not high, with some gaps from realizing the excellently coordinated stage. From the perspective of spatial distribution, the internal development of the Guangdong–Hong Kong–Macao Greater Bay Area is unbalanced, with obvious differences in development level and coupling coordination degree among cities. The convergence analysis shows that the differences in the coupling coordination degree among the cities in the Guangdong–Hong Kong–Macao Greater Bay Area have stabilized after narrowing during the study period. However, the difference among the cities with higher coupling coordination degrees tends to widen in recent years. Therefore, necessary measures should be taken to promote the coordination between sci-tech innovation and high-quality economic development in the Guangdong–Hong Kong–Macao Greater Bay Area.

Digital economy has become the primary motivation for high-quality economic development. Upon comprehensively analyzing the connotation of digital economy, this paper constructs an evaluation system from development environment, digital industrialization, industrial digitalization, and digital governance to measure China’s digital economy index from 2016 to 2018 using the entropy-based TOPSIS method. Also, based on the improved Feder dual sector model, this paper discusses the theoretical mechanism of digital economy promoting high-quality economic development directly and through improving economic efficiency and economic structure, and carries out an empirical test. According to findings, on the one hand, China is scaling up digital economy and accelerating digital transformation; on the other hand, the greater the likelihood that high-quality economic development is constrained by low economic efficiency and unreasonable economic structure, the greater the role of digital economy in promoting high-quality economic development. Therefore, this paper puts forward recommendations for China’s high-quality economic development, such as advancing new infrastructure construction, developing digital economy, improving economic efficiency and economic structure, and transforming the government governance model.

As traditional drivers fade, cultivating new drivers has become the key to the high-quality development of China’s economy. In the new round of scientific and technological revolution and industrial transformation, the digital economy plays a strategic role in promoting high-quality economic development in China, by using data as a new key production factor and innovation as the driving force, and driving impetus change, efficiency change and quality change to increase total factor productivity. The mechanism for the digital economy to cultivate new drivers for the high-quality development of China’s economy is through four dimensions, namely allocation optimization, economies of scale, industrial integration, and innovation-driven growth. In the context of the digital economy, accelerating the cultivation of new drivers calls for the following efforts: speeding up digital innovation and promoting the driving force change, efficiency change, and quality change; accelerating the process of digital industrialization and pushing advanced industrial basic capabilities; using industrial digital transformation to promote the modernization of the industrial chain; and advancing the high-quality development of the manufacturing industry, and promoting the deep integration of the digital economy and the real economy.

Using the panel data of 29 provinces in China from 2015 to 2018, this paper analyzes the impact of the internet, technological innovation, and their interaction on high-quality economic development. As the results show, the internet and technological innovation promote economic growth efficiency, economic growth stability, industrial structure optimization, and sustainable development level, where technological innovation promotes more significantly but hinders the economic welfare level to some extent; the interaction between the internet and technological innovation has a significant positive correlation with high-quality economic development and strengthens the promotion of technological innovation on high-quality economic development; human capital plays a significant role in promoting all aspects of high-quality economic development, while fiscal expenditure has no significant impact on high-quality economic development. Therefore, the internet should be leveraged to drive technological innovation capacity, and better play the guiding role of the government.