An efficient and accurate evaluation of the seismic performance of long-span continuous rigid frame bridges using a sim? plified method is essential in the design and strengthening of such bridges. As a simplified method to evaluate the seismic perfor? mance of bridges， the endurance time method can be used to simulate the whole process of bridge from intact to collapse with non? linear time history analysis only once. In order to study the applicability and accuracy of the endurance time method in evaluating the longitudinal seismic performance of continuous rigid frame， this paper investigated a long-span continuous rigid frame bridge with corrugated steel webs. Three acceleration time-history curves were generated based on the design response spectrum of China highway bridge seismic code. In addition，16 natural ground motions were selected for incremental dynamic analysis. The seismic response characteristics of continuous rigid frame with corrugated steel webs were compared and studied. The seismic response characteristics of continuous rigid frame with corrugated steel webs were comparatively studied by endurance time analysis method and incremental dynamic analysis. Research results demonstrate that the endurance time analysis method results are within the enve? lope of the incremental dynamic analysis results. The time-history analysis results are within the envelope of the incremental dynam? ic analysis results. The median value of the endurance time analysis method has an allowable error with the mean curve of incremen? tal dynamic analysis. Therefore， Endurance time analysis method can be used to evaluate seismic performance of the long-span con? tinuous rigid frame bridge.