The overall structure of main bridge of steel truss of Weifang Bailang River Bridge was analyzed by using the Midas2013 software. It is assumed that all unit adopts steel truss beam element structure form, all bar is consolidation form, work materials is among the linear elastic range, the principle of small deformation and the superposition principle is used. The research results show that the stability coefficient of truss bridge structure is 30 and this structure has high reliability.