Abstract: The multi-ribbed slab structure uses various materials and components nesting each other, which makes the entities calculation model extremely complicated, therefore, it is necessary to present the simplified calculation model of the structure.. Based on previous study and the calculation theory of modern high-rise structure , the simplified numerical model and analytical model of multi-ribbed slab structure in elastic stage are presented. According to the previous results of shaking table test on a 1/10 scaled model, the rigid frame-composite elastic plate model is employed to perform the time-history analysis, therefore, the validity of the model is verified. In addition, the comparative analysis of simplified numerical model and analytical model in practical engineering is carried out to verify the rationality of analytical model. Theoretical researches and experimental analysis show that it is not only supported by theory but also useful for practice to adopt the rigid frame-composite elastic plate model as the numerical model in elastic stage, and it is more reasonable to take the frame-composite wall model as the simplified analytical model in elastic stage ,which provides a more simplified and practical hand-calculation method for practical engineering.