The purposes of this article were to identify the relationships among mothers' parenting stress, mindfulness and children's internalizing and externalizing problems by correlation analysis and to examine whether mothers' mindfulness accounts for variance in children's behavior problems after controlling for the influence of parenting stress by hierarchical multiple regression analysis. In addition, the present study also investigates the relative contributions of four facets of mindfulness on both parenting stress and children's behavior problems by simultaneous regression analysis. Ninety one mothers whose children are in counseling completed measures of the Parenting Stress Index, Mindfulness and CBCL(internalizing and externalizing problems). The correlation analysis revealed that parenting stress was positively associated with children's behavior problems and mindfulness was negatively associated with both parenting stress and children's internalizing and externalizing problems. Mindfulness predicted significant variance in children's internalizing and externalizing problems after controlling for parenting stress. Only de-centered attention of mindfulness four facets significantly contributed to children's internalizing and externalizing problems in a negative direction. Finally, the implications and suggestions were discussed.