Abstract: Objective: To investigate the composition of troop volunteer blood donors and to analyze the blood screening test changes of the infectious diseases associated with blood transfusion.Methods: The basic data of troop volunteer blood donors were collected since January 2000 to November 2007.The blood donations were divided into four groups by age of 18-25,26-35,36-45 and 46-55.The changes of age group and sex were analyzed by SPSS software.ALT was detected by velocity.HBsAg,anti-HCV,anti-HIV and anti-TP were detected by enzyme-linked immunosorbent assay（ELISA）.Results: 100 879 plasma samples were tested,included 91 678 males' and 9 201 females'.There were no obvious changes for the sex ratio during study period.However,the order of the donation numbers for each age group was changed from 26-35＞18-25＞36-45＞46-55 to 18-25＞26-35＞36-45＞46-55 years old.Totally,there were 8 637 samples disqualified.In 2002,the ratio of disqualified samples reached top during study years（10.9%）.The reasons of disqualified sample in order were ALT（6.42%）,HBsAg（0.85%）,anti-HCV（0.44%）,anti-TP（0.19%） and anti-HIV（0.005%）.Conclusion: Youth solider,which was 18-25 years old became the main volunteer blood donors.The incidence of infectious diseases associated with blood transfusion had a decrease trend.