A　femtosecond　laser　pulse　duration　is　shorter　than　many　physical/chemical　characteristic　times,　which　makes　it　possible　to　control　electron　dynamics　such　as　ionizations　and　electron　densities.　This　study　expermetally　investigtes　the　effects　of　laser　fluence　on　sub-wavelength　periodic　surface　structuring　based　on　ultrafast　laser　electron　dynamics　control.　A　quantum　model　for　the　sub-wavelength　periodic　surface　structuring　is　also　proposed,　which　considers　both　the　wave　properties　in　the　photon　particle-properties　based　plasma　model　for　photon-electron　interactions　and　transient　localized　changes　of　material　properties.　It　shows　that　the　laser　fluence　strongly　affects　the　ablation　crater　shapes.　The　prediction　of　ablation　crater　shape　and　periodicity　is　in　agreement　with　experimental　data.