In this study we adopted the slowmation approach to investigate children's story comprehension ability and learning intentions. A digital system called Captube was designed to capture children's actions and present them in slowmation format at different speeds. A total of 317 children aged between 4 and 7 were invited to participate in this study. Evaluation activities were conducted before and after playing with the Captube system to examine the effects of slowmation. The results showed that the children had vague comprehension of slowmation and comic books in the beginning, but their story comprehension performance was enhanced after they had experiences of the Captube play. They also revealed more interest in dynamic slowmation than still comic books, which implies that their learning intentions were supported by slowmation. The findings of this study could shed some light on educational approaches for preschool children.