Multi-objective design optimization of post-tensioned box girder pedestrian bridge isrnpresented in this study. The proposed design optimization incorporates some behavior andrnside constraints specified by the AASHTO Standard specifications. Multi-objectivernoptimization is performed to minimize the cost and maximize the safety factor for thernultimate limit states. Considering stress and deflection limits as design constraints, andrngeometrical dimensions of the box-girder and shear reinforcements as design variables.rnAdditionally, application of MATLAB routine gamultiobj algorithm for the design of posttensionedrnrnpedestrian bridge is presented, and a set of solutions in the pareto front arernillustrated in graphical format. Then multi-criteria decision analysis method namedrnTOPSIS (Technique for Order Preference by Similarity to Ideal Solution) is used torndetermine the single optimal result from the Pareto set solutions by giving weight to thernobjective functions