The purpose of this study is to analyze the effect of marital conflicts perceived by fathers on preschoolers’behavior problems, and to investigate the mediating effect of paternal child rearing behavior. This study used survey data on 4 year-old infants which was conducted in 2012(5th year) by KICCE. Correlation analysis and structural equation were conducted using SPSS 23 and AMOS 23 for the data analysis, and the results of this study are as follows. First, marital conflicts perceived by fathers and preschoolers behavior problems showed a positive correlation, and they especially showed a greater positive correlation with offensive behavior, anxiety/depression, and other problems. On the other hand, it was identified that paternal child rearing behavior has a negative correlation with marital conflict and preschoolers’behavior problems when paternal child rearing behavior is compassionate and dominant. Secondly, it was identified that warm parenting behavior of fathers mediates the effect of marital conflicts on preschoolers’behavior problems. However, it was verified that the mediating effect of controlling parenting behavior is not significant. On the other hand, it was identified that the mediating effect of warm parenting behavior of fathers has a greater effect on internalized problems than external problems.