Objective To investigate the diagnostic value of transcranial Doppler (TCD) and cervical vascular ultrasound (CVUS) in outpatients with a chief complaint of dizziness.Methods A retrospective analysis was performed for the TCD and CVUS findings of 754 patients with a chief complaint of dizziness in the outpatient service of Department of Neurology.Results CVUS had a significantly higher abnormal detection rate than TCD (c²=165.517, P<0.001), and CVUS combined with TCD had a higher abnormal detection rate (72.02%) than CVUS or TCD alone. The two methods had a similar detection rate of vascular stenosis or occlusion (P=0.211), and the combination of CVUS and TCD significantly increased the detection rate of vascular stenosis. Age had a certain value in predicting abnormal blood flow parameters in the patients with dizziness (P<0.001), and CVUS could identify the abnormal state of blood vessels in patients with dizziness earlier.Conclusions TCD combined with CVUS can help to identify cerebrovascular abnormalities in outpatients with dizziness. Older patients with dizziness aremore likely to have abnormal cerebral hemodynamics, but insufficient cerebral blood supply caused by vascular stenosis is not the main cause of dizziness in outpatients.