The steel modular integrated construction is the advanced stage of the development of building industrialization. This study applied steel-concrete composite wall to steel modular integrated construction buildings and proposed simplified simulation method for the steel-concrete composite wall by considering the effect of the composite wall on the overall building mechanical property. Simultaneously, for low steel modular integrated construction buildings, it was recommended to apply performance based seismic design theory of “high bearing capacity-low ductility”. The above-mentioned method was used to analyze an 8-story steel modular integrated construction hotel building. The hotel building was adopted two standard modular units with dimensions of 3 × 6 × 3 m and 3 × 3 × 3 m. Connection elements were modeled in Midas Gen software to consider the semi-rigid joint characteristics and equivalent cross braces were built to consider the influence of the steel-concrete composite wall. And components were ensured to remain elastic during moderate earthquake events without plastic deformation. The structural components’ performance level was classified as 3, with ductility grade of V, and plate component width-thickness ratio limit of S5. The results showed that new composite wall improved the lateral stiffness of the overall structure. The maximum stress ratio of the components was 0.85, which remained elastic under moderate seismic conditions, and the maximum inter-story drift angle of the structure was 1/385. The maximum width-thickness ratio of the components could reach 36.