Research conclusions:The the static and dynamic analysesof the supermajoroverpasson the 3rd ring road in Chengdu show that all indexes of the bridge meet the code requirements. As the bearing force at joint point of arch beam is complicated, the three -dimensional prestressed structure should be designed, the beam end ofmain beam should be widened and heightened, andwebs should be thickened. The stress concentration happens in some partsbecause of the complicated structure. Based the research and calculation, the applicable range of tied arch structure in construction of railway bridge iswidened by adopting new scientific research achievements and theories athome and abroad and it can provide the reference to the similar works.