This study investigated the difference that social-demographic variable influenced youth`s isolation feeling and youth`s isolation feeling depending on poor youths` isolation feeling, the difference of isolation feeling according to parents` economic condition and parents` social position, living standard, living satisfaction level, and school type as the important variables here and analyzed the relative influence of variables related to youth`s isolation feeling on the basic, as it is based on the recognition that the youths before the entry into adult period are on the developmental crisis condition to solve the formation of identity and the problem of individualization, and the isolation feeling brought from perplexity or frustration in the process to solve such a problem may prohibit the progressive development into adult period as well as youth`s psychological well-being.