The purposes of this research are to construct the Scale of Emotional Intelligence suitable for use with junior high school students, to develop an adaptive index for their EI measurements, and to compare the EIs of students with different backgrounds (region, school, grade, sex, family structure, parental educational level and profession). From a sample of 2,029 junior and senior high school students, factors and indices for the EI Scales were determined through analysis of various items and factors. Reliability, validity, and norm of the Scales were then examined upon the scales’ completion. Results of the research show that EI Scales are capable of effectively measuring 5 separate abilities: emotional cognition, emotional expression, positive inspiration, emotional regulation, and emotional reflection. Emotional regulation and emotional reflection differ among students from different regions. The average values for emotional cognition, emotional expression, and positive inspiration differ among students from different grades. Students with different birth order also differ in total EI scores and in individual EI scores. Female students tend to have higher EI total scores and in each individual EI scores than male students. Finally, parental educational level or profession was not related to EI scores.