As an improved technique of reinforced soil, the geosynthetic reinforced soil-integrated bridge system(GRS-IBS) could reduce the differential settlement at the roadbed-bridge transition section so as to avoid “bridgehead bump” effectively. But at present, GRS-IBS structure is mostly designed with reference to reinforced earth retaining wall, and its design method needs to be improved on account of the difference in bearing characteristics between two structures. Considering this, based on a bridge in Taihang No.1 Tourism Road K43+175 in Shanxi Province, the GRS-IBS was designed referring to the relevant specifications, and a Finite difference numerical model in the same condition was also established by FLAC3D to analyze the abutment deformation, the geogrid tensile force and the panel stress respectively to guarantee the safety of engineering structure. The results show that not only the internal and external stability of GRS-IBS should be validated, but also the bearing capacity and the geogrid tensile force should be checked using the formula recommended by FHWA; the GRS-IBS structure with cast-in-place concrete panel could meet the requirement of relevant specifications for the differential settlement at the roadbed-bridge transition section, but the top of the panel should be reinforced to ensure the safety of engineering structure; the maximum tensile stress of the panel with GRS-IBS structure was located in its lower part, and the reinforcement was suggested on the tension side to avoid concrete cracking.