Abstract:    To successfully promote and expand the Chinese-style modernization, we must firmly grasp the development opportunities of digital economy and adhere to digital innovation to guide the development. Accurately grasping the promotion potential of digital innovation, accurately analyzing its imbalance crux and exploring its balance path have an important impact on the construction of Chinese-style modernization.In this paper, based on the theoretical connotation of digital innovation, a comprehensive measurement index system of digital innovation efficiency was constructed. Taking major national strategic regions as the breakthrough point, this paper scientifically measured the efficiency of China′s digital innovation, and deeply discussed the status, dynamic evolution and causes of regional differences. Firstly, the super efficiency SBM model was used to comprehensively measure the development level of China′s digital innovation from 2008 to 2021. Secondly, Dagum Gini coefficient and its decomposition method were used to explore the size and source of regional differences in China′s digital innovation development. Thirdly, the kernel density estimation method was used to describe the distribution dynamic evolution characteristics of digital innovation development. Finally, with the help of QAP method, this paper explored the causes of spatial imbalance in the development of digital innovation.Through the measurement and trend evolution of the development level of digital innovation in major national strategic regions from 2008 to 2021, it was found in this study that: firstly, the digital innovation efficiency of the whole country and its major national strategic regions show a fluctuating upward trend during the inspection period, but there is a significant gap among regions; secondly, during the study period, the imbalance of digital innovation development space in major national strategic regions shows a downward trend year by year, and the overall gap is mainly due to the gap between regions; thirdly, the overall dispersion of digital innovation development in China is expanding, and different regions show different types of polarization trends, and the polarization trend is gradually increasing; fourthly, the degree of opening to the outside world is the biggest cause of the formation of national differences in digital innovation development, while the intensity of the formation and change of regional differences in digital innovation development exists regional heterogeneity, and the dominant factors in different regions are different.A comprehensive review of the development status, spatial imbalance and evolution of digital innovation has important enlightenment and practical significance for improving the development level of China′s digital innovation and boosting the high-quality development of the digital economy.

Key words: digital innovation, Chinese-style modernization, major national strategic area, spatial imbalance