：阅读推广是图书馆在一定情境下为用户提供的专门服务，由主体、客体、环境等要素构成。文章基于班杜拉社会认知理论，将三元交互决定论运用到阅读推广领域，通过解读三元交互决定论在阅读推广领域的适用性，构建了阅读推广情境、用户内在个人因素、用户阅读行为这三种主要因素之间的交互因果关系模型；进而引入班杜拉社会认知理论中的自我效能理论，阐释了用户阅读自我效能通过阅读认知、阅读动机、阅读情感、阅读选择这四个过程对阅读行为的作用机制，具化用户内在因素与阅读行为间的交互因果关系；提出通过用户自我效能提升来优化用户阅读行为，从而提升阅读推广效果的理论思路。

Reading promotion represents the trends of the library development with its elements of subject, object and environment, which provides specific services to its users. This paper extends triadic reciprocal determinism (TRD), which is one of the representative of Bandura` social cognitive theory(SCT), to the situation of reading promotion field. Theoretically grounded in the three-component model of TRD and by interpreting the applicability of TRD, the theoretical framework, which covers three main factors of reading promotion, users' internal personal factors and users' reading behavior, is constructed, aiming to help enrich the theoretical system of  library reading promotion. Based on TRD,this article introduces self-efficacy, which affects human behavior through four processes of cognition, motivation, choice and affect, into the constructed model to elaborate the interactive causality between user's internal factors and reading behavior within the model of reading promotion triadic reciprocal determinism, aiming to interpret in details the mechanism of user reading self-efficacy through reading cognitive, reading motivation, reading emotion and reading choice. Thus the paper provides value to library reading promotion from the perspective of user`s reading self-efficacy.