Commercially　pure　titanium　was　selected　to　be　a　model　material.　Commercially　pure　titanium　plates　with　different　types　of　dislocation　boundaries　were　prepared　by　multi-pass　cold　rolling.　As-impacted　titanium　samples　were　obtained　by　a　split　Hopkinson　pressure　bar,　and　the　evolution　of　dislocation　boundary　was　characterized　through　transmission　electron　microscopy.　The　high-speed　deformation　response　of　dislocation　boundaries　in　the　commercially　pure　titanium　was　launched.　Results　show　that　the　initial　dislocation　boundary　becomes　a　major　obstacle　to　dislocation　slipping　under　high-speed　compression　at　the　strain　rate　of　1000　s(-1).　Plates　with　geometrically　necessary　boundaries　at　the　spacing　of　0.5　mu　m　can　generate　new　dislocation　boundaries　intersected　with　the　initial　ones　after　high-speed　deformation.　When　the　spacing　of　geometrically　necessary　boundaries　is　below　0.3　mu　m,　the　dislocation　groups　form　among　them.　As　the　spacing　of　geometrically　necessary　boundaries　declines　to　0.1　mu　m　or　below,　the　localized　microstructure　mode　is　bending　of　initial　boundary　and　dislocation　groups.　There　are　only　dislocation　groups　and　sub-grain　in　the　highly　localized　zone.