Aim To study the values of color doppler ultrasonography (CDU) for vertebral artery cervical spondylosis. Methods The changes of structure, velocity (V), blood flow volume (Q), resistance index (RI), and pulsatility index (PI) of 50 cases were studied. 30 healthy subjects were included in the study and served as a control group. Results As compared with the control group, RI and PI were significantly increased (p<0.05) and systolic peak flow velocity (SPV), end-diastolic flow velocity (EDV), Q were slightly reduced(p>0.05) in cervical spondylosis group(p>0.05). Conclusions CDU provide a valuable objective basis on morphological and hemodynamic changes of the vertebral artery cervical spondylosis patients with vertebrobasilar insufficiency (VBI).