The purpose of this study was to develop a preschool expressive language scale for the Spectrum Assessment System based on the Korean language development. The Spectrum Assessment System was developed by the staff of Project Spectrum at the Harvard Graduate School of Education as an innovative approach of Gardner(1983). The Storyboard Activity included in the assessment activities for language domain were supposed to sample children`s use of language and the fluency affected by underlying intelligence in real and meaningful daily activities. Subjects were 29 kindergartners(13 males and 16 females) at the age of 3 to 5 years. Statistical methods applied to this study were average, t-test, correlation, Cronbach` α, factor analysis. The results of this study can be summarized as follows: (1) The average score of the 3-year-olds group and that of the others showed significant difference. There was no statistically significant difference between male and female groups in the average score. (2) The Cronbach`s α of the expressive language scale was .956. The correlation among the inspectors ranged from .88 to .92. These results indicate that the scale has a sufficient level of reliability. (3) Factor analysis extracted three factors, organization, interaction and pronunciation for the preschool expressive language scale.