The main structure of Jordan Subcritical Facility is standing on the long steel tubal supporting leg, it is possible for the supporting legs to lose its stability, so the buckling analysis should be carried out severally. The eigenvalue buckling analysis is carried through using the buckling analysis function The main structure of Jordan Subcritical Facility is standing on the long steel tubal supporting leg, it is possible for the supporting legs to lose its stability, so the buckling analysis should be carried out severally. The eigenvalue buckling analysis is carried through using the buckling analysis function