In 1973, homosexual has been removed from DSM-III-R. However, some negative homosexual stereotypes still exist in our society nowadays, which made homosexual people/individuals facing lots of unequal treatment in their lives. Such disadvantageous prejudices and discriminations might impact their “coming out to the public” or not in a serious way. According to the literatures, “interpersonal relationship”, “self-esteem” and “autonomy support” items can predict the outness level of homosexual people effectively. In the formal study, the reliability and validity of the questionnaires had been examined; all items used in the formal questionnaires were checked by experts, and thenTaiwanuniversity students as participants (N = 122) completed the pretest. The result shows that items “interpersonal relationship questionnaire (Cronbachα = .93)”, “self-esteem questionnaire (α = .90)”, and “autonomy support questionnaire (α = .95)” both have high reliability and validity, and are appropriate to be used in further studies. In the further studies, homosexual individuals will be used as participants to examine that: (1) Relationships among items “interpersonal relationship”, “self-esteem”, “autonomy support”, and “outness level”; (2) Whether above three items can predict “outness level” efficiently in the same way. More details are discussed in this article.