Abstract: Objective: To investigate the relationship between benign prostatic hyperplasia(BPH) and primary hypertension. Methods: One hundred BPH patients were divided into the BPH complicated with hypertension(group A, 45 cases), and hypertension group(group B, 55 cases). The group A were subdivided into team according to the systolic and diastolic pressure, and the course of hypertension. The age, IPSS, PV, PSA and urinary retention times between two groups were analyzed by statistical method. Results: The age, IPSS, PV and urinary retention times in group A were significantly higher than those in group B(P<0.05 to P<0.01). The difference of age in the patients with systolic pressure more than 160 mmHg was statistically significant(P<0.01). The urinary retention times and PV in group A with systolic pressure from 90 to 110 mmHg and diastolic pressure more than 110 mmHg were higher those in group B(P<0.05 to P<0.01). The age, IPSS and urinary retention times in the patients with hypertension course more than 20 years were more than those in the patients with hypertension course less than 10 years and from 10 years to 20 years(P<0.05 to P<0.01). Conclusions: Hypertension may affect the occurrence and clinical progression of BPH. Early controlling and improving high blood pressure can be conducive to relieving the symptoms.