This study investigated how young children s characteristics of temperament and gender according to their temperament between and within groups perceived by teachers would be reflected in their self-regulation. For the purpose, following research questions were set up: 1. How does young children s self regulation emerge according to their temperament perceived by teachers? 1-1. Is there any difference of young children s self-regulation between temperament groups perceived by teachers according to gender? 1-2. Is there any difference of young children s self-regulation within temperament groups perceived by teachers according to gender? Subjects were 47 easy children (14 boys and 33 girls) and 36 difficult children (28 boys and 8 girls) who were selected after the Young Children s Temperament Test for Teachers administered to 277 five-year-old children attending 11 public kindergartens in Sooncheon, Jeonnam. Selected subjects age ranged from five years and four months to six years and one month and their age average was five years and ten months (five years and ten months for both boys and girls). To measure young children s temperament, Kang s (1997) scale for teachers consists of four subscales, that is, approach or withdrawal, adaptability, quality of mood, and intensity of reaction. This scale was revised version of Gordon s (1981) scale which used five subscales from the Instrument for Young Children s Temperament (Thomas, Chess, & Korn, 1977). As a measure of young children s self-regulation, the Young Children s Self-regulation Scale for Teachers (Yang, 2006) was used. The means and standard deviations of young children s temperament and self-regulation were first computed from collected data. t-tests were then conducted to investigate any difference of self-regulation between easy and difficult children groups perceived by teachers according to gender. Secondly, t-tests were also conducted to investigate any difference of self-regulation within easy and difficult children groups perceived by teachers according to gender. Results of this study were as follows: First, self-regulation scores between easy and difficult boy groups showed significant difference in cognitive and emotional regulations (p< .001). Specifically, boys children s self-regulation showed significant differences according to temperament in cognitive regulation factors such as planning and monitoring/evaluation and emotional regulation factors such as emotional recognition, emotional control, and emotional management (p< .001). Second, self-regulation scores between easy and difficult girl groups showed significant difference in cognitive and emotional regulations (p< .001). Specifically, girls self-regulation showed significant differences according to temperament in cognitive regulation factors such as planning and monitoring/evaluation and emotional regulation factors such as emotional recognition, emotional control, and emotional management (p< .001). Third, young children s self-regulation within easy temperament group showed significant difference according to gender in emotional regulation (p< .05). Cognitive regulation showed no significant difference, however. Specifically, young children s self-regulation showed no significant difference according to gender in cognitive regulation factors such as planning and monitoring/evaluation and emotional regulation factors such as emotional recognition and emotional management. Conversely, emotional control showed significant difference (p< .01). Fourth, young children s self-regulation within difficult temperament group showed no significant difference according to gender. In other words, cognitive and emotional regulation according to gender showed no significant difference. Specifically, young children s self-regulation showed no significant difference according to gender in cognitive regulation factors such as planning and monitoring/evaluation and emotional regulation factors such as