Based on Bower's affective network theory, the article links the dynamic analysis of affective factors in affective instruction, and presents affective instruction strategic of dynamic synchronization between teacher and students to implement the best ideal mood that promotes students' cognition and affection together. In the process of teaching, the main mood of teacher and students varies spirally from unbalance through balance to unbalance, ultimately attains affective balance on the higher level, and the teacher steps well together with students. Moreover, the dynamic synchronization is analyzed in detail from induction, edification, activation, and adjustment of basic factors in instruction, and contributes to affective instruction goals.