Taking a continuous rigid-frame bridge under construction near Kunming as the research subject, edge span ratio, beam bottom effect curve, 0 block beam height and span beam height four parameters are selected as variables. 25 continuous rigid-frame models are established with different parameter combinations and utilizing ANSYS software for static pushover analysis. Through orthogonal test based on seismic performance optimization ,it is found that the edge span ratio is 0.6, the number of beam base parabola is 1.6,0 block beam height is 11.21 m, cross the beam height is 4.75 m. This optimization approach represents a significant breakthrough in the design of continuous rigid-frame bridges, not only enhancing structural seismic performance but also providing reliable guidance for engineering practice, thus possessing important practical and scientific significance.