Abstract: In recent years, with the rapid development of my country's social economy, the transportation industry has ushered in rapid development, and bridge engineering has become an important project that promotes the development of various industries. At the same time, the requirements for construction technology of bridge engineering projects are constantly improving. From the perspective of bridge engineering projects, the construction of subgrade and pavement has a profound impact on the construction quality of the overall project, and the construction of subgrade and pavement is an important part of the overall project. The construction unit should conduct in-depth understanding and strengthen protective measures to prevent occurrence as much as possible. Rework twice to improve the quality of the project and eff ectively expand the service life of the bridge.