Abstract: A study is made on the distribution regularities of internal forces of Nielsen style concrete-filled steel tubular tied arch bridges under different loads such as distributed force, concentrated force and live load. The results are compared to those of Lohse style arch and parallel rib arch. Model tests are carried out to verify the effectiveness of the theoretical computation. The results show that the design scheme of the model is reasonable and feasible, and the experimental results obtained on the model can accurately reflect the mechanical properties of Nielsen style concrete-filled steel tubular tied arch bridges.