Based on the design and complete construction techniques of 500m-span concrete filled steel tubular (CFST) arch bridge, a feasibility study on design and construction techniques of 700m-span CFST arch bridge was conducted. The general design and construction schemes were figured out, and key techniques were detailed studied such as manufactory and installation of arch ribs, concrete grouting in tube, etc.. The results showed that there are no technical hurdles to build 700m-span CFST arch bridges. Considering economical efficiency, safety and other factors, CFST arch bridge is a strong competitor when building a 700m-span bridge and should be put on engineering practice and spread as soon as possible.