Digital services promoted by digital technology have had a profound impact on the global economicand trade pattern. Based on the application of principal component analysis (PCA) to the evaluation of thedigital service level along the Belt and Road, this paper uses the gravitational expansion model to empiricallystudy the impact of the digital service level on the exports of these countries, and further classifies the empiricalregression according to the difference of the national income level. It is found that the digital divide betweenhigh-income countries and low-income countries is obvious, and the improvement of the level of digital servicesof both sides will contribute to the growth of both sides' trade exports. However, the impact of digital serviceson the exports of countries with different income levels is different. In addition, both FTA and ICT importsinteract with the level of digital services to promote trade development. At the end of this paper, it is suggestedthat the high income countries along the Belt and Road should pay attention to the development of digital keyapplication technology and the formulation of digital regulatory rules. The low-income countries along theBelt and Road should pay attention to improving the popularity of digital infrastructure and the level of digitalconnectivity, so as to enhance the level of digital services in these countries and promote their developmentrapidly.