Objective:To find the changes in knowledge

belief and performance（KBP）of highway construction workers before and after AIDS project intervention

in order to provide scientific basis for the further health education.Methods:Multi-stage sampling method was used to choose 8 sections from 14 sections along the highway to do a one-year survey.Advocacy

behavioral change/publicity education intervention were performed to investigate and analyze their AIDS knowledge

belief and performance（KBP）before and after the intervention.Results:Two groups respectively including 946 and 975 men were investigated before and after the intervention.Investigate supervisor

project manager contractor

drivers

skilled workers and unskilled workers were respectively 63

116

46

104

292

274 people before the intervention

and 69

123

56

101

269

331 people after the intervention

without difference in age

education level

marital status

monthly income between the two groups（P>0.05）.On whether or not heard of AIDS

the answers of the supervisor

project managers

contractors

drivers and technical workers before and after intervention were similar

but the answers of non skilled workers with lower educational level were greatly improved after the intervention（86.4% vs.93.2%

P=0.03）.On the three major transmission ways of AIDS

the driver’s correct answer rate for blood transfusion（91.3% vs.100%）

sex（93.3%vs.100%）and infant-mother（84.6% vs.95%）was increased after the intervention（P<0.05）;so did other people.On correct understanding of using condoms to prevent HIV infection was improved in project managers

contractors

drivers and technical workers except supervisors（P<0.05）.There was no change in condom use rate among the total population when having sex with commercial sex worker（69% vs.80.3%）or temporary partners（55.7% vs.58.9%）（P>0.05）.Conclusion:Health education of HIV prevention should be conducted among the road construction workers urgently.The intervention of advocacy

behavior change

publicity and education of the population is expected to improve their consciousness and correct their unsafe sexual behavior.Further health education of HIV prevention should be enhanced in order to improve their knowledge and awareness

to avoid the happening of high-risk behaviors.