Objective To explore the effect of primipara-spouse double subject online courses of pregnant women school on breastfeeding health education premised on the Information-Motivation-Behavioral Skills (IBM) Model. Methods The primiparas undergoing cesarean section and their spouses were conveniently selected and randomized into two groups, those admitted in section A of obstetric department were taken as the control group (n=63), the primiparas were the subject and received routine breastfeeding health education, and the others hospitalized in section B were regarded as the experimental group （n=64）, the primipara-spouse double subject received the online courses of pregnant women school on breastfeeding health education and management premised on the IMB model.The spouses′ score of Father Support Breastfeeding Self-Efficacy Scale-Short Form (FBSES-SF) and the primiparas′ score of Breastfeeding Self-efficacy Scale (BSES) before and after the intervention and the exclusive breastfeeding rate at 6 weeks after delivery were compared between the two groups. Results After the intervention, the spouses′ score of FBSES-SF and the primiparas′ score of BSES, and the rate of exclusive breastfeeding at 6 weeks after delivery in the experimental group were significantly higher than those in the control group （P＜0.01 for all）. Conclusion The primipara-spouse double subject online courses of pregnant women school on breastfeeding health educationg premised on the IMB model can play an active role in supporting breastfeeding of primiparas′ spouses, improve primiparas′ breastfeeding self-efficacy and exclusive breastfeeding rates after delivery.