As an improved technology of reinforced soil, the geosynthetic reinforced soil-integrated bridge system (GRS-IBS) could reduce the differential settlement between the abutment and the bridge approach embankment to avoid "bridgehead bump " effectively. However, the design approach of GRS-IBS has not yet been comprehensive that it could only refer to the similar geotechnical structure such as the reinforced retaining wall so far. Considering this, relying on the demonstration project of GRS-IBS in Taihang No.1 Tourism Road K43+175 in Jincheng City, Shanxi Province, a project design was presented referring to the domestic and foreign relevant specifications, and a numerical model at the same condition was also established using FLAC_^3D to analyze the abutment deformation, the geogrid tensile force and the panel stress respectively to confirm the rationality of design method as well as the structural safety. The results show that not only the internal and external stability of GRS-IBS should be calculated, but also the bearing capacity should be checked using the formula recommended by FHWA because of the differences with the traditional reinforced retaining wall in both the structural form and the bearing mode, and the geogrid tensile force should also be calculated using the formula recommended by FHWA; the GRS-IBS structure with cast-in-place concrete panel could meet the requirement for the differential settlement between the abutment and the bridge approach embankment in relevant specifications, but the top of the panel should be strengthened locally to ensure the safety of engineering structure; the maximum tensile stress of the panel of GRS-IBS was located in its lower part, and it was suggested that a certain amount of reinforcement was necessary to share the tensile stress on the tension side of the panel to avoid cracking.