本研究旨在探討人口變項、父母教養行為、依附關係與雙胞胎的個人化之關係。本研究以76位成年雙胞胎為研究參與者（男性31人，女性45人），所使用的工具包括「雙胞胎個人化量表」、「雙胞胎父母教養行為量表」及「雙胞胎依附關係量表」。資料分析以描述統計、單因子單變量變異數分析、單因子多變量變異數分析及多元迴歸等統計方法進行分析。 本研究的主要發現如下： 一、 在現況方面，本研究之成年雙胞胎在個人化及依附關係的的得分偏高。在父親及母親教養行為的類別以父母親使用較多「情感支持」行為的成年雙胞胎居多；依附關係的類別則以屬於「安全天堂」及「趨近尋求」等安全依附關係的成年雙胞胎人數最多。 二、 不同人口變項的成年雙胞胎，其個人化程度有差異。不同年齡、雙胞胎本身的社經地位在個人化的有顯著差異。而不同性別、父母的社經地位、胎性、雙胞胎排行、家中手足總數的成年雙胞胎在個人化則沒有顯著差異。 三、 經歷不同父親及母親教養行為的成年雙胞胎，其個人化的程度有差異，即父親及母親「情感支持」教養行為較多，整體「個人化」及「分化」的程度較高；父親「拒絕」教養行為使用較多，則「獨立」的程度較低。 四、 不同依附關係的成年雙胞胎，其個人化的程度沒有差異。 五、 父親「情感支持」教養行為、母親「情感支持」教養行為、「趨近尋求」依附關係、「安全天堂」依附關係，對個人化的表現有正向預測效果。其中以父親「情感支持」行為的預測效果最好。 六、 父親「拒絕」教養行為、父親「一致性」教養行為、母親「拒絕」教養行為、母親「一致性」教養行為、「分離抗拒」依附關係對個人化的表現有負向預測效果。其中以父親「拒絕」教養行為為主要預測變項，其次是母親「拒絕」教養行為。 最後，根據本研究之主要發現提出若干建議，以供雙胞胎父母與未來研究之參考。 關鍵詞：成年雙胞胎、個人化、父母教養行為、依附關係 / The main purpose of this study was to explore the relationships between adult twins’ parental rearing behaviors, attachment relationship, demographic variables and their individuality. The participants were 76 adult twins (31 males and 45 females). The employed instruments included Individuality Inventory for Twins, Parental Rearing Behavior Inventory for Twins, and Attachment Relationship Inventory for Twins. The applied analysis methods were Descriptive Statistics, One-way Multivariate Analysis of Variance, One-way Analysis of Variance, and Multiple Regression. The main findings of this study were as follows: 1. The adult twins in this study had an above-average level of individuality and attachment relationship. As for the categories, most twins belonged to the attachment of “safe heaven” and “proximity seeking,” and most twins belonged to the parental rearing behavior of “emotional warmth”. 2. The adult twins’ age and socioeconomic status had significant effects on their performance of individuality. However, the adults twins’ gender, zygosity, birth order of twins, number of siblings, and their parents’ socioeconomic status had no significant effects on their performance of individuality. 3. The adult twins who experienced different parental rearing behaviors had varied level of individuality. More specifically, those who experienced more parental behaviors of “emotional warmth” outperformed their counterparts in overall individuality and the index of “differentiation,” while those who experienced less “rejection” behaviors from their fathers outperformed their counterparts in the index of “independence”. 4. Adult twins with different attachment relationship did not differ in their performance of individuality. 5. Father’s and mother’s rearing behaviors of “emotional warmth” and the attachment of “proximity seeking” and “safe heaven,” especially father’s rearing behaviors of “emotional warmth,” could positively predict the adult twins’ performance of individuality. 6. Father’s and mother’s rearing behaviors of “rejection” and “consistency” and the attachment of “separation protest,” especially father’s rearing behaviors of “rejection,” could negatively predict the adult twins’ performance of individuality. Finally, after discussion, some suggestions were proposed for the parents of twins and future research. Keywords: Adult Twins, Individuality, Parental Rearing Behaviors, Attachment Relationship.