This study explored the relationships among perception of parental relationship, attachment to parents, and attitudes toward marriage in single adults. The survery instruments included the “Parental Marital Relationship Scale”, “Attachment to Parents Scale”, and “Attitudes Toward Marriage Scale”. A total of 147 teachers and 111 engineers from six cities in Taiwan completed the survey. Data were analyzed by t-test and canonical correlation analysis. Resutls were as follows. First, Perception of parental marital relationships showed significant differences among single adults of different genders, occupations and family structures. Second, attachment to parents showed significant differences among single adults of different occupations and family structures, but no significant sex difference was found. Third, attitudes toward marriage showed significant differences among single adults of different genders, occupations and family structures. Fourth, two types of canonical correlation were found between the single adults’ perception of parental marital relationships and their attachment to parents. Fifth, one type of canonical correlation was found between the single adults’ perception of parental marital relationships and their attitudes toward marriage. Finally, two types of canonical correlation were found between the single adults’ attachment to parents and attitudes toward marriage. Implications for practice and future research are discussed.