Abstract:〔Abstract〕 Objective The results of the detection of group B Streptococcus (GBS) in pregnant women in the third trimester of pregnancy in Quanzhou were analyzed. Methods From January 2021 to December 2022, 2194 pregnant women who attended the outpatient clinic of the Department of Obstetrics and Gynecology of Quanzhou Children's Hospital and were hospitalized in the inpatient department as the research subjects, and the vaginal and rectal secretion samples of pregnant women were collected, and all were detected by fluorescence quantitative polymerase chain reaction (FQ-PCR) method and bacterial culture method. The results of GBS tests in pregnant women of different ages and years of detection were analyzed. Results Among the 2194 pregnant women tested, the overall positive rate of GBS is 6.88 %. The GBS positivity rate was the highest in the group older than 39 years old, and the lowest in the group younger than 25 years old, and the differences were statistically significant between the groups (P < 0.05); The GBS positivity rate of the remaining age groups was not statistically significant (P > 0.05). There was no significant difference in the GBS positivity rate among pregnant women in different years (P > 0.05). Conclusion The positive detection rate of GBS in Quanzhou is at a medium level in China, and with the increasing age of pregnant women, the positive rate of GBS continues to increase, which should be paid attention to clinically. Vaginal and rectal secretions should be collected at the time of testing, and pregnant women with positive test results should strengthen susceptibility testing and give timely treatment, which can effectively improve maternal and infant outcomes.