Modified asphalt pavements are needed to resolve pavement distress problems like rutting, pot-hole and warm asphalt pavements are needed to solve energy saving, reduction of noxious gasses emission and early traffic opening. To present these two characteristics, we developed polymer-modified warm-mix asphalt binder and mixtures and evaluated their performance by optimizing polymer-modified warm-mix additive. As results, physical properties and rheological characteristics of polymer-modified warm-mix asphalt binder are similar to normal modified binder. And we confirmed that polymer-modified warm-mix asphalt mixtures satisfied quality standard of Ministry of Land, Infrastructure and Transport.