Hypertension is a chronic, increasing and deadly disease. Incidence rate of hypertension has increasingly elevated on the world over and also in Vietnam, yet no investigation on the issue ever carried out in Ninh Hoa. An investigation namely "Study on hypertension situation at Ninh Hoa town, Khanh Hoa in 2011" was accordingly conducted. Objectives : To investigate the rate of hypertension in the adult aging or = 25 years of Ninh Hoa, Khanh Hoa, To reveal several related factors of hypertension in the adult aging or = 25 years of Ninh Hoa. Khanh Hoa. Study design: Cross-sectional investigstion. Subjects: 850 men and women aging or = 25 years and residing at Ninh Hoa, Khanh Hoa, Methods: all enrolled participants underwent measurements of height, weight, waist, hip and BMI, WHR calculation. blood pressure and interview. Evaluations were based on criteria issused by WHO, JNC VI and Vietnam national heart association. Results: Hypertension rate was 26,5 percent (95 percent CI: 23,5 percent 29,5 percent), high-normal blood pressure was 10,5 percent and isolated systolic hypertension was 7,6 percent. Several related factors of hypertension: age, sex, excessive alcohol intake, smoking, dietary sodium, obesity. Conclusions: high rate of hypertension was almost similar to that in other regions over the country, and that rate obviously increased with aging, excessive alcohol intake, smoking, dietary sodium, overweight, obesity.