The purposes of this paper were to explore theories of young children's emotional development proposed by personality psychologists, to describe research findings on young children's emotion understanding concluded by developmental psychologists, and to further suggest how to facilitate young children's emotional development based on the descriptions of these theories and research findings. Theories of emotional development of S. Freud's, K. Horney's, H. S. Sullivan's, C. Rogers', and A. Bandura's and findings of five studies done during recently ten years were presented. Based on thedescriptions of these theories and research findings, the author's suggestions for young children's parents and teachers were proposed as follows: (a)accepting young children's all emotional responses; (b) appreciating all kindsof young children's emotional experiences; (c) employing the attitude ofempathy to approach young children's emotional experiences; (d) guidingyoung children's awareness and expression of emotion in everyday's life anddaily activities; (e) using dialogue between adults and young children toapproach children's emotion; and (f) playing the role of a model of youngchildren's learning how to express their emotion.