With　a　goal　of　reducing　the　weight　of　fan　blade　containment　system　for　jet　engine,　the　high-velocity　impact　response　of　carbon　fiber　reinforced　polymer　(CFRP)　panels　reinforced　with　stiffeners　were　tested　and　analyzed.　Ballistic　impact　tests　on　stiffened　panels　have　been　carried　out　with　cylindrical　Ti-6Al-4V　projectiles　at　different　velocities　(210　m/s,　70　m/s　and　90　m/s).　Results　showed　there　was　a　significant　influence　observed　due　to　different　impact　velocities　on　the　response　of　the　panel　skin　and　the　stiffener,　and　the　middle　stiffener　played　an　important　role　in　impact　energy　absorption.　Numerical　simulations　were　conducted　to　provide　further　insight　into　the　target　response　by　employing　a　user　subroutine　VUMAT　with　revised　Hou　criteria　in　commercial　finite　element　(FE)　software　ABAQUS.　The　stiffened　CFRP　panel　was　found　to　possess　a　14%　higher　critical　penetrating　velocity　than　the　CFRP　laminated　plates　with　same　mass　by　using　validated　FE　models.　Combining　with　detailed　discussion　of　high-velocity　penetration　process,　the　energy　absorption　mechanism　of　the　stiffened　panel　under　high-velocity　impact　was　analyzed,　indicating　that　the　improvement　on　high-velocity　impact　response　is　due　indirectly　to　structural　alteration　induced　better　energy　absorption　by　less　punch-shear　laminate　breakage　and　more　fiber　tensile　failure.　©　2020　Elsevier　Ltd