Abstract: Objective　The study was conducted to find out the epidemic trend of AIDS in Zhongshan city in Guangdong province. Methods　To study the epidemiologic situation of HIV, the cross-sectional method was conducted to research the detection rates of HIV test from 2004 to 2007. Results　The infection rate of the population in Zhongshan city has reduced since 2004; the differences among the total detection rates of general population, bridge population and high-risk population were statistically significant(Xsup2/sup＝250.12, IP/I0.05); the differences between the detection rates of general population, bridge population were also statistically significant (Xsup2/sup＝48.97, IP/I0.05). Conclusion　The analysis of HIV detection rate is related with many aspects, so a conclusion cannot be achieved easily; more surveillance station should be founded, and surveillance on bridge population should be emphasized.