This document presents research on how the use of WeChat contributes to intimacy in romantic relationships. A survey was conducted to examine the relationship between intensity of WeChat use and perceived intimacy. The results found a significant positive relationship, supporting the hypothesis. A focus group further explored what functions of WeChat fulfill intimacy needs between couples. Functions like voice messages, photos, and viewing moments gratified needs like social presence, self-disclosure, and uncertainty reduction. Limitations and directions for future research are also discussed.