OBJECTIVETo understand the epidemiological characteristics of syphilis infection in blood donors of Chinese Nanjing area, to strengthen control of blood quality and to provide the scientific evidence for working out the strategy of prevention and treatment of syphilis infection.

METHODSFirstly the double antigen sandwich ELISA was carried out according to its instructions, test results showing positive will be examed by double orifice second-round.

RESULTSA total of 362425 blood samples were collected from 2010 to 2014, among them 1277 positive samples were detected. The average rate of syphilis infection was 0.35％. The positive rates of different old years were statistically different（X(2)=265.679,P<0.001）, and the change trend of 5 years was statistically different(X(2)trend=237.928,P<0.001）. Among all age groups in the detection of treponema pallidema(TP), the most amount of positive samples and the lowest positive ratio 0.23% were found in the group 18 to 29 years old. The highest positive ratio was shown in age 50 years old and above. There was statistical different in all age groups(X(2)=361.620,P<0.001）. The positive ratio of the detection of TP was 0.32% in male donors which was lower than that in female donors(0.42%). There was statistical different in all sex groups(X(2)=24.659,P<0.001）. Peasant group had the highest positive ratio(1.07%) in the detection of TP and the student group had the lowest positive ratio(0.19%). There was statistical different in all occupation groups(X(2)=300.198,P<0.001）. Junior and under group had the highest positive ratio(0.59%) in the detection of TP and the undergraduates group has the lowest positive ratio(0.19%). There was statistical different in all education groups(X(2)=241.734,P<0.001）. Through chi-square test and trend test analysis showed that there was statistical different in sex, age, educational level and occupation differences. The tendency of the groups' statistics in 5 years is equally important.

CONCLUSIONIt is necessary to publicize blood donation information consultation scientifically before blood donation, especially for high-risk population. To ensure blood supply safety, it is important to recruit low-risk blood donors and develop permanent voluntary blood donors for reducing blood waste.