Conducted cross-sectional survey in 1500 women aged 15-49 years old in 4 wards (Thac Gian, Chinh Gian, An Khe and Hoa Khe) in Thanh Khe - Da Nang, 1551 women in 5 wards (Tan Tien, Tan Phong, Tan Mai, Trung Dung, Thong Nhat) in Bien Hoa and 6600 women in Phu Cat - Binh Dinh, the authors found that: The rate of spontaneous abortionin in Thanh Khe - Da Nang is: 3.79 percent, in Bien Hoa is 6.58 percent, in Phu Cat Binh Dinh is 4.45 percent. The proportion of maternal with miscarriage in Thanh Khe - Da Nang is: 3.92 percent, in Bien Hoa is 8.09 percent, in Phu Cat - Binh Dinh is 9.58 percent. The rate of stillbirth in Thanh Khe - Da Nang is: 1.59 percent, in Bien Hoa is 2.38 percent, in Phu Cat - Binh Dinh is 0.49 percent. The proportion of maternal with stillbirth in Thanh Khe - Da Nang is: 1.64 percent, in Bien Hoa is 3.08 percent, in Phu Cat - Binh Dinh is 1.29 percent. In Thanh Khe - Da Nang, the rate of birth defect is 1. 76 percent, In Bien Hoa is 2.27 percent, Phu Cat - Binh Dinh is 1.83 percent. In Phu Cat - Binh Dinh and in Bien Hoa, there is correlation between abnormal pregnancy and exposure to agent orange chemical (OR: 1.75 and 3.19).