Abstract: Objective: To evaluate the effects of fathers' involvement and support on breast feeding. Methods: From May 2015 to October 2015, a convenience sample of 175 parents of infants were included in this study, the control group (n=86) received routine care. The intervention group (n=89) received both routine care and intervention provided to encourage fathers' involvement. Results: Scores of breastfeeding attitude in intervention group were higher than that in control group after intervention (P<0.05). The mean scores of Breastfeeding Self-Efficacy Scale (BSES) and breastfeeding rate in the intervention group when discharged, 6 weeks, and 4 months after delivery, were all higher than those in the control group (P<0.05). The satisfaction level with husband's involvements in intervention group 4 months after delivery was higher than that in control group (P<0.05). Conclusion: Through effective intervention on strengthening fathers' engagement and support could improve the practice of breastfeeding. Health care staff can develop programmes to involve fathers in breast feeding.