In　order　to　evaluate　the　performance　of　silt　subgrade　under　traffic　loading,　a　series　of　repeated　triaxial　tests　were　conducted　to　investigate　the　resilient　behavior　of　compacted　silt　under　various　physical　and　mechanical　conditions.　Based　on　test　results,　a　predictive　model　of　resilient　modulus　(Mr)　using　variables　of　deviator　stress　and　physical　states　of　specimens,　was　developed.　It　shows　that,　under　repeated　loading,　Mr　of　compacted　silt　decreases　gradually　with　increasing　deviator　stress.　for　a　stable　specimen,　there　is　a　＇critical　resilient　modulus＇,　but　for　a　failed　specimen,　Mr　decreases　continuously.　Moreover,　Mr　of　compacted　silt　decreases　with　increasing　water　content,　especially　under　lower　degree　of　compaction,　higher　water　content　and　higher　deviator　stress　levels,　and　Mr　increases　with　increasing　compaction.　Furthermore,　the　predicted　Mr　fits　measured　ones　well.　©　2010　ASCE.