The　photon-assisted　shot　noise　through　a　quantum　dot　in　the　Kondo　regime　is　investigated　by　applying　time-dependent　canonical　transformation　and　non-crossing　approximation　technique.　A　basic　formula　for　the　photon-assisted　shot　noise　is　obtained.　The　rich　dependence　of　the　shot　noise　on　the　external　ac　field　and　temperature　is　displayed.　At　low　temperature　and　low　frequencies,　the　differential　shot　noise　exhibits　staircase　behavior.　When　the　temperature　increases,　the　steps　are　rounded.　At　elevated　frequencies,　the　photon-assisted　tunneling　becomes　more　obvious.　We　have　also　found　that　the　Fano　factor　is　enhanced　as　the　ac　frequency　is　enhanced.　(C)　2011　Elsevier　B.V.　All　rights　reserved.