OBJECTIVE： To study the effects of telmisartan combined with finasteride on blood pressure rhythm （BPR） in non-dipper type hypertension patients with benign prostatic hyperplasia （BPH）. METHODS： From Jul. 2015 to Dec. 2016， medical information of 190 patients with non-dipper type hypertension complicated with BPH were retrospectively collected from Halison International Peace Hospital， and then divided into control group （n＝82） and observation group （n＝108） according to therapy plan. Control group was given telmisartan 40 mg， qd； observation group was additionally given finasteride 5 mg， qd， on the basis of observation group. Both groups were treated for 12 months， and followed up once every 3 months. The changes of blood pressure （24 hSBP， 24 hDBP， 24 hPP， dSBP， dDBP， dPP， nSBP， nDBP， nPP）， morning blood pressure surge， prostate volume， nocturia times， the changes of BPR （the rate of non-dipper type blood pressure change） were observed in 2 groups. The occurrence of ADR was observed. RESULTS： Before treatment， there was no statistical significance in blood pressure， morning blood pressure surge， prostate volume or nocturia times between 2 groups （P＞0.05）. After treated for 3， 6， 12 months， blood pressure， morning blood pressure surge， prostate volume， nocturia times and the rate of non-dipper type blood pressure change in 2 groups were decreased significantly； the observation group was significantly lower than the control group， with statistical significance （P＞0.05）. There was no statistical significance in the incidence of ADR between 2 groups （P＞0.05）. CONCLUSIONS： Telmisartan combined with finasteride show significant effects on non-dipper hypertension complicated with BPH， effectively reduce the level of blood pressure， prostate volume， nocturia times and improve BPR with good safety. The effect of two-drug is better than that of telmisartan.