Abstract: Objective　The study was conducted to determine the epidemiological characteristics of various sexually transmitted diseases (STDs), providing evidence for the development of specific control strategies. Methods　Descriptive analysis of the changing trend was conducted based on the data from the national disease surveillance report system from 2004-2007. Results　From 2004-2007, the reported incidence of gonorrhea was declining, whereas that of syphilis, AIDS and the infection rates of HIV increased. Ascending of incidence of the three STDs was shown in people above 15 years of age, and peaks in 25 to 29 year olds, followed by the decline of incidence of gonorrhea and AIDS. Except for the 5 to 14 year old groups, the reported incidence of syphilis was obviously higher than that of gonorrhea and AIDS/HIV. The sex ratio of syphilis patients was lower than 1 since 2006, indicative of more female patients than male ones; at the same time, the sex ratio of gonorrhea patients and those infected by HIV was still higher than 1, men patients being predominant. Conclusion　Different epidemiological characteristics were found in gonorrhea, syphilis, and AIDS/HIV, which were nonetheless classified as STDs. Analysis of their own nature would facilitate to plot the epidemic patterns of theses diseases. Given the rising incidence of syphilis since 2004, intensified prevention and control of this disease should be guaranteed to contain the morbidity and to control the prevalence of AIDS/HIV as well.