In this study, Seismic Performance of Yarimburgaz Viaduct, which is on Km: 16+862 of Istanbul - Edirne Highway, is evaluated. Multimodal spektral analysis is performed by linear methods for strength based evaluation under the seismic effect of design earthquake. Same viaduct is evaluated by deformation based nonlinear methods under seismic effects of simulated minimum and maximum earthquake loads. Pushover analysis and time - history analysis have been applied to the model of the structure. A detailed performance evaluation of an existing structure is clarified by comparing the conclusions of those analysis.