In order to investigate the ultimate capacity and failure modes of the ultra- high-performance concrete filled in the high-strength steel tube (UHCFST) arch under one point loading. Based on previous studies, in this study, four finite element models of arch including one concrete filled in steel tube (CFST) arch and three UHCFST arches were performed and analyzed subjected to L /4 loading. The parameters of finite element analysis are the replacement normal concrete of with ultra-high-performance concrete (UHPC) and the variation strength of UHPC. The finite element analysis confirms that the UHCFST arch has higher ultimate bearing capacity and ductility than CFST arch, and that all increase with the improvement of UHPC strength. The failure mode of CFST arch and UHCFST arch are the failure of concrete at the side of load. The stress of concrete infilled in UHCFST arch is more uniform than that of CFST arch during the loading.