This study aims to find out the moderating effect of social support on the relationship between selfdifferentiation
and social problem-solving skills in early adulthood and level of. In order to verify this data,
it was used with Self-differentiation level Inventory, Social problem solving Inventory, Social support
Inventory for 399 adult aged from 20 to 40 in Seoul, Gyeonggi, Chungnam Province. The results were as
follows: First, the level of self-differentiation, social problem-solving skills and social support were found to
have statistically significant correlation. Self-differentiation showed a significant positive correlation with
positive problem-oriented and rational problem solving skill of the sub-factors of social problem-solving skills,
while Negative problem orientation, impulsive/careless responses, and avoidant responses showed a significant
negative correlation. social support showed a positive correlation with Positive problem-oriented and rational
problem of the sub-factors of social problem-solving skills, while Negative problem-oriented and
impulsive/careless responses, and avoidant responses showed a negative correlation. Second, the level of
self-differentiation according to gender differences in social support is not statistically significant, whereas, the
men's on social problem-solving skills scores was more statistically significant than women. The difference
regarding cohabitation is that people living alone perceived more social support than living with parents, and
it was found that the group living with parents tent to think problem much negatively than the groups
with spouse in social problem-solving skills. Third, social support showed a moderating effect on
self-differentiation and social problem-solving skills. Based on the results, implications of this study and
suggestions for subsequent research were discussed.