Dislocation　boundary　response　and　characteristic　micro-structure　were　investigated　in　commercial　pure　titanium　during　the　penetration　impact　and　dynamic　compression.　The　initial　dislocation　boundary　induced　by　cold　rolling　can　strengthen　the　adiabatic　shearing　sensitivity　of　commercial　pure　titanium　during　the　penetration　impact,　which　is　consistent　with　the　mechanical　response　and　micro-structure　during　the　dynamic　compression.　The　compression　with　a　loading　direction　vertical　to　the　initial　geometrically　necessary　boundaries　(GNBs)　results　in　the　decrease　in　the　spacing　between　GNBs,　while　the　compression　with　a　loading　direction　parallel　to　the　initial　GNBs　attributes　to　the　generation　of　new　dislocation　boundary　crossed　with　the　initial　one.　Then,　a　model　of　distribution　and　morphology　of　dislocation　boundary　around　crater　is　proposed.