Abstract: In order to enhance the stability of single layer dome,Vierendeel dome was presented by employing lattice bar. Vierendeel arch is the key part of Vierndeel dome,while its research is few. It was made a thorough research on its static performance,and the results indicate that the Vierendeel arch is similar to full_web arch in macro while they are different in local; the ultimate bearing capacity of Vierendeel arch is 8～10 times that of a full_web arch with the same section area; it can provide good performances even is semi_arch load. Moreover,it is also found that Vierendeel arch is not sensitive to initial imperfect and change of the constraint condition. Therefore Vierendeel arch,compared with full_web arch,has better mechanical performance.