Objective To grasp the infect situation of HBV in our university

find out the progress of prevention against HBV virus in nine years

offer the basis for making more effective precautionary measures in the future. Method The freshmen Between 1997 and 2005 over 9 years have been tested for carrying HBV

and divided the result into groups according to sex and grade

and calculated the positive rate

checked it out with the χ

2

and linear regress equation. Results HBsAg positive rate accord to the linear equation Y=-0.31X +625.98

and the correlation R=-0.642. It is about 6.2 % that the HBsAg positive rates of the boys and 3.9 % for the girls in 9 years.Conclusion It is a downward trend that the HBsAg positive rate from 1999

and went up to some extent from 2003. The boy’s positive rate is higher than the girl in 9 years. We should actively inoculate the vaccine into the non-infective person.