Background : Hypertension is one of the causes of early death in people in the world. According to WHO, hypertension is thought to be the cause of death about 12,8% of the total deaths in the world. Meanwhile, the prevalence of prehypertension is 20 – 25% of the adult population in the world. The prevalence of hypertension in Indonesia at age > 18 years old is 25,8%. The purpose of this study is to know the prevalence of prehypertension and hypertension of the students of UMY and the risk factors which associated to prehypertension and hypertension. Methods : This research is an observational analytic research with cross sectional approach. The respondents are 1.346 students of UMY who will implement KKN with 1.038 students fit to the inclusion criteria. The inclusioncriteria is student who completely fulfill the questionnaire. The data analysis using Chi-square test for the bivariate analysis and Logistic regression test for the multivariate analysis. Results: The prehypertension prevalence of UMY students is 40,7% (423 students) and the hypertension prevalence is 9,6% (100 students). The bivariate analysis result between each risk factor of prehypertension are physical activity (p = 0,257), smoking (p = 0,002), salty food intake (p = 0,876) and obesity (p = 0,020). The multivariate analysis between smoking and obesity with prehypertension incident showed the result of p value is 0,004. The bivariate analysis result between each risk factor of hypertension incidents are physical activity (p = 0,303), smoking (p = 0,011), salty food intake (p = 0,674) and obesity (p = 0,001). The multivariate analysis between smoking and obesity with hypertension incident showed the result of p value is 0,199. Conclusions : Smoking and obesity both caused prehypertension incidentsignificantly. Meanwhile, smoking and obesity both do not caused hypertension incident significantly.