Using different continuous rolling speeds， small-diameter TC4 titanium alloy bars were heated and rolled in the α+β two-phase region. The effects of continuous rolling speed on the microstructure and properties of TC4 titanium alloy bars were analyzed under identical rolling temperatures and deformation rates. Results indicate that the selection of continuous rolling speed directly influences the microstructure and mechanical properties of TC4 bars. As rolling speed increases， primary α grains exhibit a pronounced tendency toward equiaxed refinement. However， when rolling speed exceeds a critical threshold， phase transformation occurs in the bar core， forming Widmanstätten structure， which subsequently degrades the mechanical properties of the bars. TC4 bars are rolled below this critical speed exhibit a uniform， fine-grained primary α+β two-phase work-hardened microstructure， delivering excellent overall properties.