Purpose: The purpose of this study was to investigate the relationships between parenting behavior, parenting efficacy, adaptation stress and PTSD (Post Traumatic Stress Disorder) among mothers who have defected from North Korean. Methods: A descriptive study was conducted to illustrate the parenting behavior, parenting efficacy, adaptation stress and PTSD and report the relationships among them. Data were collected between August and November of 2009 in Hanawon and 105 mothers who met eligibility criteria participated in the study. Results: Ignorant/controlling parenting behavior of parenting showed the highest score in our study. The level of parenting efficacy was $2.72{pm}0.36$ and adaptation stress level was $3.35{pm}0.47$ showing perceived hostility the highest and homesickness the lowest. Participants with moderate to severe PTSD accounted for 79.5% of the mothers, and 75% of them reported symptoms for 3 months or more. Authoritative parenting behavior showed negative relationships with parenting efficacy, cultural crisis and fear, adaptation stress and PTSD. Conclusion: Mothers who have defected from showed negative parenting behaviors and high adaptation stress level and PTSD while parenting efficacy was high. These findings indicate that parenting intervention programs which can guide these mothers towards positive parenting behaviors need to be developed.