The aim of this study is to develop a valid scale to measure the construct of the sexual-moral attitudes of Chinese college students. Based on open questionnaire investigation, in-depth interviews, exploratory factor analysis and confirmatory factor analysis, the 20-item Sexual-Moral Attitudes Scale (SMAS) was developed and emerged with good psychometric properties. The multi-hierarchy and multi-dimension construct was confirmed. It can be concluded that contemporary Chinese college students has two moral criteria systems to regulate their sexual behaviors. The first one is the Basic Sexual-Moral Principles, which includes two first-hierarchy dimensions as Sense of Responsibility and Sense of Ethics; the second one is Strict Sexual-Moral Principles, which includes three first-hierarchy dimensions as Being in Love, Chastity and Fidelity.