The purpose of the paper is to examine whether the sub-constructs of self-determination, that is, learners' perceived level of autonomy, competence, and relatedness, predict learning flow, persistence, and achievement in a blended learning context. Participants are 102 adult learners who voluntarily registered for a Chinese language learning seminar, which consisted of weekly offline meetings and supplementary online activities for 24 weeks. A series of regression analysis revealed that autonomy, competence, and relatedness significantly predicted learning flow, which significantly predicted persistence. Also, competence and relatedness, and learning flow predicted achievement. [For the full proceedings see ED562127.]