The project is located in Saraburi, Thailand. The completion of the project has greatly improved the transportation from Bangkok to Saraburi, bringing convenience to the local people and driving the rapid development of the local economy. The three-dimensional highway is also brought to the local area with a beautiful scenery. During the construction of the Thailand viaduct project, we conducted in-depth exploration and research, and formed the construction method of the section box girder under the American standard, which successfully solved the problem of the erection of the box girder.