Abstract: This paper analyzes the static stability of steel pipe arch truss by using large finite element program ANSYS.It also takes into account the influence of some factors on it,such as primitive deficiency,the scope of load action,constraint conditions and so on.The results indicate that its losing stability pattern is unitary losing stability.The primitive deficiency has distinct influences on its bearing capacity and deformation when steel arch truss loses stability,and its critical bearing capacity under hal...