The study collected data on self-representation, self-concealment, and intimacy satisfaction of 147 couples by questionnaire star and analysed it by spss software. The results showed that (1) Disclosing secrets can enhance intimacy satisfaction, and keeping secrets has no significant positive effect on enhancing intimacy satisfaction. (2) Partners are usually more willing to share personal attitudes and less willing to share privacy and interactions with the opposite sex. (3) High-satisfaction partners are more likely to share matters common to both partners in the relationship and topics related to intimacy. Low-satisfaction partners were less likely to share private topics. The study reveals the secret-sharing characteristics of high-satisfaction partners in intimate relationships.