The purpose of the study was to investigate the relationship of codependency and adolescents´ parent-child relationship. Seven hundred twenty-three students from the first to third year of 23 senior high schools in Taipei, Taiwan (291 males, 432 females) were sampled. Instruments employed were the Parent-Child Relationship Scale and the Codependency Assessment Scale. Data obtained were analyzed by frequency distribution, t-test, two-way analysis of variance and canonical correlational analysis. Major findings were: (a) adolescents with chronic family stress had higher degrees of codependency and two codependency characteristics,(b) males and females differed significantly on degree of codependency and codependency characteristics, (c) adolescents´ gender and parents´ gender evidenced interaction effects on four elements of the parent-child relationships, (d) males and females demonstrated canonical relationships between their parent-child relationship and codependency.