Objective With data of health monitoring point of middle schools in Xichang to collect the brachial artery blood pressure monitoring results there and analyze the changing trend

therefore to provide reliable basis for the development of policies

strategies and measures in prevention and control of chronic non-communicable diseases such as hypertension in adolescents.Methods According to the quantity and distribution of middle schools in Xichang

a full-time middle school was selected randomly as monitoring point.All the middle school students were regarded as objects of study and all the students had physically examined by team from monitoring organization every September and October from 2009 to 2011

thus the monitoring results of the brachial artery blood pressure were collected.Results From 2009 to 2011

the annual detection rates of overweight were 7.49%

7.89% and 8.93%

detection rates of obesity were 3.08%

2.98% and 3.04%

when the detection rate of overweight and obesity of objects from different year compared

there were no statistically significant difference（P>0.05）.Each year from 2009 to 2011the research object of the systolic blood pressure were（97.41±8.30）mmHg（1mmHg=0.133kPa）

（98.72±8.07）mmHg and（101.67±9.52）mmHg respectively

comparing the three

the difference was statistically significant（F=208.56

P<0.01）;and comparing one to another

according to the results of research

the systolic blood pressure of 2011 was higher than 2010

while the systolic blood pressure of 2010 was higher than that of 2009

and differences were statistically significant（P<0.05）.Each year from 2009 to 2011the diastolic blood pressure of research objects were（62.35±5.08）mmHg

（62.55±5.46）mmHg and（64.00±5.61）mmHg respectively

comparing the three

the difference was statistically significant（F=92.53

P< 0.01）;the comparison between one and another showed that in 2011 the diastolic pressures of the research objects were higher than that in 2010

and in 2010 the diastolic pressures of the research objects were higher than that in 2009

and the difference had statistical significance（P<0.05）.The difference between the systolic blood pressure and the diastolic blood pressure of objects with different gender showed statistically significance（P<0.05）.Conclusion The brachial artery blood pressure of middle school students in Xichang increases obviously annually

so the local prevention and control of chronic non-communicable diseases in adolescents should attach importance to the primary prevention.