Recent research on epistemological beliefs emphasized that learners’ notion about the nature of knowing and knowledge influences their learning process. The purposes of this study were to integrate literature on epistemological beliefs and learning, and to propose an Epistemological Beliefs in Learning Process Model that includes four components of epistemological beliefs, learning motivation, action control, and learning strategies. This study verified the goodness of fit between empirical data and theoretical model by using the method of structural equation modeling. Participants were 412 students from five junior high schools in Northern Taiwan. The instruments included Epistemological Beliefs Inventory, Learning Motivation Inventory, Action Control Strategies Inventory, and Learning Strategies Inventory. Whereas the Chi-square test may be influenced by sample size, the results showed that Epistemological Beliefs in Learning Process Model fitted the observed data well, and the effect analysis of latent variables supported recent theories about epistemological beliefs and learning. Suggestions for further research are proposed.