The　viscoelastic　and　viscoplastic　properties　of　asphalt　binder　are　valuable　to　the　performance　research　on　the　asphalt　mixture　and　pavements.　Especially　at　high-temperature　condition,　the　viscoplastic　characteristics　of　binder　play　an　important　role　in　rutting-resistant　performance.　This　paper　presents　a　viscoplastic　modeling　method,　which　originates　from　the　strain-hardening　model,　to　study　the　unrecoverable　strain　response　for　binder　in　a　repeated　shear　creep　recovery　test　using　a　Dynamic　Shear　Rheometer　(DSR).　Two　types　of　asphalt　binders　were　evaluated　in　this　study,　namely　the　neat　binder　PG58-28　and　the　SBS　polymer-modified　binder　PG70-28.　In　order　to　fit　the　model　coefficients,　a　series　of　10　cycles　repeated　creep　recovery　test　were　designed　to　conduct　under　multiple　stress　levels　25　Pa,　50　Pa,　100　Pa,　doubled　to　6400　Pa　and　three　different　time　durations　which　included　0.1　s　creep　+　0.9　s　recovery　and　1　s　+　9　s　as　well　as　10　s　+　90　s.　Test　results　and　modeling　work　indicate　that,　compared　with　the　measured　viscoplastic　strain,　the　strain-hardening　viscoplastic　model　can　work　well　on　the　binder　unrecoverable　strain　response　prediction　in　repeated　creep　recovery　test　under　lower　stress　levels　and　shorter　creep　duration　and　it　is　necessary　to　take　the　damage　factor　into　consideration　in　the　future　work.