【Objective】 To explore the protection function on the pelvic floor through pelvic muscle training during the pregnancy. 【Methods】 A total of 360 pregnancy women who were 16+1 ~ 30 gestational age were randomly allocated to a training group and a control group. The training group attended the pelvic muscle training while the control group received the customary information. The two groups finished the questionnaire and were measured the pelvic floor strength when they first seek medical advice. After 8 weeks pelvic muscle training

they finished the questionnaire and were measure the pelvic floor strength and did the pelvic organ prolapse quantification system 6 weeks after delivery. 【Results】 The final total effective cases is 329. Pelvic floor muscle strength was significantly higher in the training group [VRP is (53 ± 14) cmH2O

VSP is (96 ± 25) cmH2O in 166 cases] than that in the control group [(46 ± 12) cmH2O

(89 ± 27) cmH2O] after 8 weeks pelvic floor muscle training (P < 0.05). The second stage of labor of training group was (60 ± 28) min

shorter than the control group which was (76±17) min (P < 0. 05). Six weeks after delivery

more women in the training group reported no prolapse with significant: 113 of 166 (68.07%) versus 82 of 163 (50.31%) (P = 0.001). 【Conclusion】 Intensive pelvic floor muscle training during pregnancy can significantly improves pelvic floor muscle strength

shorten the second stage of labor and decrease the prevalence of pelvic organ prolapse.