In the present study, the relation between children's emotion knowledge and preschool teachers' book reading behaviors during shared book reading in the classroom was examined. A new coding system, the Book Readings for an Affective Classroom Education (BRACE), was developed to capture teachers' macro-level book reading behaviors (i.e., dialogic reading) and micro-level use of emotion language (i.e., emotion coaching) during shared book reading. Results showed good reliability and validity of the BRACE. Further, teachers' dialogic reading and emotion coaching behaviors during shared book reading positively predicted child emotion knowledge in Spring (T2), after controlling for children's initial level of emotion knowledge in Fall (T1). In addition, a significant interaction between teachers' book reading style and child emotion knowledge at T1 on emotion knowledge at T2 indicated that teachers' effective book reading style was especially beneficial to children who had lower emotion knowledge at the beginning of the school year.