Improving the GVC position of service industries of countries along the Belt and Road is an important component of joint building a high-quality Belt and Road. Based on the data of ADB-MRIO database and UIBE GVC Indicators database from 2007 to 2020, this paper empirically examines the impact of the implementation of the Belt and Road Initiative on the GVC position of service industry of the countries along the route using the time-varying DID method. The results show that the Belt and Road construction has significantly promoted the GVC position in services of countries along the route, and a series of robustness tests support this conclusion.The heterogeneity analysis shows that the Initiative has significantly improved the GVC position of productive、transport and social services in countries along the Route. The construction of the Belt and Road Initiative has more significant positive impact on the GVC position of services in developing countries, and the positive effect is also more significant in non-ASEAN countries and countries far from China. The mechanism test suggests that the Initiative improved the GVC position of service industries of countries along the Route through increasing bilateral direct investment, and improving the level of infrastructure.