The purpose of this study was to examine for the relationship between mother's smart phone addiction tendency and young children's smart phone addiction tendency and how young child ren's self-regulations. The survey was conducted in the Kwang ju of 204 mothers having young children's years from six to seven years old. The result from the research is summarized as follows, First, mother's smart phone addiction tendency expresses the positive correlations among young children's smart phone addiction tendency, and young children's self-regulations were negatively correlates with young children's smart phone addiction tendency. The relationship of mother's smart phone addiction tendency with young children's smart phone addiction tendency was partially mediated by young children's self-regulations.