Based on a 7-story reinforced concrete plane frame structure, the guarantee rate and suitability of Pushover analysis method were discussed by statistically analyzing the probability distribution of the performance point of the Pushover analysis method of plane frames with different seismic intensities, site conditions and design earthquake groups in various seismic fortification levels. The results show that Pushover analysis method is a static elastic-plastic analysis method, which is not suitable for evaluating the structural elastic seismic behaviour.