The study mainly investigated the in-plane stability of concrete-filled steel tubular parabola Vierendeel arch byadopting methods of theoretical derivation and numerical simulation.Firstly , the finite element software was used toestablish the model of concrete-filled steel tubular circular arch , which was compared with the experiment to prove the cor-rectness of the modeling method.What's more, the exquivalent slenderness ratio of parabola vierendeel arch was deduced,and the development trend of displacement , axial forwe and bending moment of Vierendeel arch was studied.Finmall ,accord-ing to the finite element calculation results , the molified formula of stability factor considering rise span ratio was used.Itwas found that the modified formula was in good agreement with the finite element results,and can be used to guide the en-gineering design.