As　a　model　material,　commercial　pure　titanium　was　rolled　to　plates　with　different　dislocation　boundaries.　The　dynamic　mechanical　response　of　Ti　specimen　was　analyzed　during　impacted　with　Split　Hopkinson　Pressure　Bar　(SHPB)　at　different　strain　rates,　and　microstructure　evolution　was　investigated　using　optical　microscopy　and　transmission　electron　microscopy.　It　was　found　that　adiabatic　shear　sensitivity　was　decreased　with　increasing　strain　rates　for　all　as-annealed,　25%　and　50%　cold　rolled　states.　To　the　contrary,　for　70%　cold　rolled　state　the　adiabatic　shear　sensitivity　was　increased　with　increasing　strain　rates.　The　microstructure　of　adiabatic　shear　bands　(ASBs)　were　developed　from　elongation　morphology　to　fine　equiaxed　grains　in　the　specimens　of　25%　cold　rolled　state,　and　ASBs　became　broader　with　increasing　strain　rate.　©　(2014)　Trans　Tech　Publications,　Switzerland.