Abstract: Focusing on the actual conversion effects of reading promotion is of great significance for advancing the depth and quality development of library reading promotion. Promoting e-books through WeChat official account posts is currently an important method for encouraging digital reading in libraries. Taking the Dongguan Library as an example, this article uses e-book reading conversion rate as the core indicator for evaluating promotional effectiveness. Through data correlation analysis, comparative analysis, and inductive analysis, it reveals the relationship between post viewership and e-book reading conversion, as well as the characteristics of posts and e-books with high reading conversion rates. The article identifies the factors influencing the effectiveness of promoting e-books through WeChat posts and proposes promotional strategies, including enhancing content planning for e-book promotions, leveraging social and cultural trends to highlight relevant reading resources, conducting user surveys to enable targeted recommendations, and optimizing external factors such as post positioning, the number of e-books featured, and content repetition.