Objectives The purpose of this study is to determine the impact of multicultural mothers' acculturation stress on the social withdrawal of multicultural adolescent children in the first year of middle school, and to verify the double mediation effects of multicultural mothers' parenting efficacy and parental monitoring.
 Methods The subjects of the study used the fourth data from the Multicultural Adolescents Panel Study(2014), which involved 1,301 multicultural adolescents and their multicultural mothers. Data analysis was performed us-ing the SPSS 26.0 program for frequency analysis, descriptive analysis, and Pearson correlation analysis. In addi-tion, Process Macro 4.0 and Model 6 developed by Hayes (2021) were used to test the research model and the double mediation effects.
 Results First, multicultural mothers' acculturation stress had a statistically significant effect on their adolescent children's social withdrawal. Second, multicultural mothers' acculturation stress had a significant negative (-) ef-fect on parenting efficacy, and parenting efficacy had a significant positive (+) effect on parental monitoring. Third, parental monitoring had a significant negative effect on children's social withdrawal. Fourth, a significant double mediation effect of parenting efficacy and parental monitoring was confirmed in the impact of multicultural moth-ers' acculturation stress on their children's social withdrawal. In other words, the greater the acculturation stress of multicultural mothers, the lower their parenting efficacy, low parenting efficacy predicted low parental monitor-ing, and low parental monitoring in turn predicted high social withdrawal in children.
 Conclusions It was confirmed that the higher the acculturation stress of multicultural mothers, the lower their pa-renting efficacy, and thus the lower the level of parental monitoring, which has a negative impact on the social withdrawal of adolescent children. To help the development of multicultural families and promote the healthy growth of multicultural adolescents, specific action plans were presented to reduce the acculturation stress of multicultural mothers and prevent and reduce the social withdrawal of multicultural adolescent children.