The study was conducted in July of 2011 in Tam Hong district, Phu Tho province. A total of 532 married women at the age of child bearing 18 - 49 were gynecologically examinated and the samples of their vaginal discharge were taken to identify parasites. The results showed that the rate of reproductive tract infection (with syndrome) was clinically 79.0 percent. The rate of reproductive tract infections in relation to the knowledge, attitudes and practices of the study subject was as follows: Knowledge: The women had a little knowledge about the measures such as condom use, monogamy, personal daily hygiene, menstrual hygiene, periodic health checkup for disease prevention, which generally accountedfor a low rate of 45.6 percent to 78.0 percent. Attitude: The women had a low attitude when they got the disease. Only 45.0 percent (104/260) of the interviewed women had a right behavior, such as going to the doctor for examination and treatment and 43.0 percent of the women had an improper behavior when they got infected such as hiding disease, feeling ashamed, and not seeking for medical examination and treatment at health facilities ... and 13.0 percent did not have any attitudes towards their disease. Practices: 41.2 percent of the infected women did their self-treatment, 31.1 percent had examination at communal health stations, 10.2 percent went to private clinics, and 8.7 percent didn!t look for any medical examination and treatment. The risk factors which were the most associated with bacterial infection of the study subjects reproductive system were: working in the water and poor reproductive tract hygiene with the corresponding value of standardized regression coefficients (Beta = 0.360, p 0.01) and (Beta