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Finire element modeling methods of steel-concrete composire structure with overlap slab were investigated.A two-step finite element method wag presented.It was applied to analyze an extra long span composite bridge.The conversion of structure system and the mechanical behavior of the bridge were analyzed with two different construction methods.The stresses of steel beams, precast slabs and in-situ-place concrete under the total load were compared. The results show that steel-concrete composite structure with overlap slab has many advantages, the construction method that the top in-situ concrete and the concrete in construction joints are cast respectively is rather reasonable than the one that the top in-situ concrete and the concrete in construction joints are cast at the same time, and the two-step finite element method is affective to such large-scale structures.