The stability analysis on the first type and the second type under the dead and the live load were introduced, meanwhile, the two types were compared.

To solve the problem of first stability of the arched beam combined bridge, this paper proposed dimensional finite element models to analyze buckling modality with reference to the Sheyang River Bridge, in the case of different parameter of components, and summarized the general conclusion, and then optimized design structure.

Considering the problem of bigger difference and less information among three existing analytical solutions,the method of numerical simulation was proposed,and therefore,the distribute of high order e- lectric fields,the first stability regions,mass spectra peaks were got on the variety geometrical errors by this method.

Defining the stable classification number by Fisher's Law;