This short-term longitudinal study was designed to examine relational aggression associated with social skills and anxiety-withdrawn behavior of preschool children. Relational aggression, social skills (self-control skills, friendship making skills, and assertion skills), and anxiety-withdrawn behavior of one hundred and twenty 5-year old children were assessed two times across a 6-months period by using teacher rating measures. For the data analysis, the children were divided according to their first and second relational aggression scores into 4 groups: high-high, low-low, high-low, and low-high. The high-low group (i.e., composed of children who decreased the manifestation of relational aggression) increased self-control skills and decreased anxiety-withdrawn behavior. On the other hand, the low-high group (i.e., composed of children who increased the manifestation of relational aggression) relatively decreased self-control skills and increased anxiety-withdrawn behavior. These findings suggest that relational aggression and self-control skills are inversely related and point to the possibility that the teaching of self-control skills could contribute to the decrease of relational aggression. Furthermore, assessment of relational aggression may play an important role in the early detection of children's adjustment difficulties.