【Objective】 To study blood pressure level and the epidemic status of hypertension in teenagers aged 12~17 years old in Changsha in order to provide reference data for prevention of teenagers hypertension. 【Methods】 According to cluster sample method sampling pricipal, all students from junior 1 to senior 2 in 18 middle schools were measured about their blood pressure, height and weight. At the same time, the level of blood pressure and nutrition status were evaluated. 【Results】 1)Among 18 922 teenagers aged 12~17 years old, 1 276 teenagers were attacked with hypertension and 1 127 teenagers were borderline hypertension, their prevalence ratios were 6.7% and 6.0% respectively. 2)The levels of SBP and DBP increased as the age rised. In 12 years old, the levels of SBP and DBP among girls were more than those of boys. The boys gradually catched up after then and exceeded girls. 3)The hypertension ratio among boys was more than girls and increased as the age rised. But the borderline hypertension ratios were higher among girls and lower age groups. 4)In the obesity group, the hypertension ratio and borderline hypertension ratio were highest and which were second in overweight group and lowest in the normal weight. There was significant difference among groups(χ²=69.348,P=0.000). 【Conclusions】 The hypertension ratio is intermediate level for teenagers aged 12~17 years old in Changsha, the blood pressure level of boys rises rapidly. The hypertension ratio is positively correlated with obesity.