Objective To explore the clinical curative effects of angiotensin Ⅱ 1 receptor blocker in treating primary hypertension and its effects on insulin sensitivity.Methods Eighty primary hypertension patients were divided into the treatment group ( 40 cases,treated with telmisartan ) and the control group (40cases,treated with amlodipine) by random digits table.The treatment period was 8 weeks.After treatment,the clinical curative effect and insulin sensitivity was compared between the two groups.Results In treatment group and control group,the total effective rate was 75.0％(30/40) and 72.5％(29/40),there was no significant difference (P＞ 0.05 ).Before treatment,the insulin sensitivity index ( ISI ) in treatment group and control group was -4.5 ±0.8 and -4.7 ±0.7 (P ＞ 0.05),after treatment,the ISI was -3.2 ±0.5 and -4.4 ±0.6 (P＜0.05).Conclusion The clinical curative effects of angiotensin Ⅱ 1 receptor blocker in treating primary hypertension are obvious,and may improve the insulin sensitivity.