We　proposed　a　high-performance　optical　coherence　velocimeter　(OCV)　based　on　broadband　optical　interference　which　achieves　spatial　resolution　from　interference　cancellation　or　enhancement　of　different　components　of　the　broadband　light.　There　is　a　challengeable　issue　for　OCV　that　the　interference　fringes　become　blurred　when　the　velocity　of　detected　object　is　relatively　large,　hindering　the　pace　of　OCV　application　in　high-velocity　field.　To　resolve　this,　the　relationship　between　blurry　coefficient　and　OCV　system　parameters　(e.g.,　exposure　time,　central　wavelength,　bandwidth　of　source)　was　derived.　It　was　found　that　blurry　coefficient　changed　with　oscillatory　decay　form　and　reached　the　minimum　at　each　order　blurry　velocity.　It　showed　that　maximum　measurable　velocity　of　OCV　systems　could　reach　10th　order　blurry　velocity.　The　measurement　of　vibration　of　the　loudspeaker　driven　by　a　function　signal　generator　was　employed　to　experimentally　verify　the　velocity　measurement　performance　of　the　system.　The　experiment　demonstrated　that　the　developed　OCV　can　provide　large　velocity　measurement　ranges　from　static　to　25.2　mm/s　with　nanometer-level　precision　and　maximum　measurable　vibration　frequency　of　up　to　50　kHz.　However,　in　theory,　the　theoretical　maximum　measurable　velocity　can　be　up　to　1.06　m/s　for　current　OCV　configuration.　The　OCV　has　high　precision,　large　dynamic　range,　and　high-velocity　measurement　capability,　making　it　attractive　for　applications　in　mechanical　structure　vibration　monitoring　and　acoustic　measurement.　©　2019　Optical　Society　of　America.