The purpose of the study was to evaluate story retelling abilities of preschool children. Methods: The participants comprised 60 preschoolers aged 4 to 6 years. Two Korean stories written by Soyeong Pae, “The Swing Story” and “The Ball Story” were used. We showed the story cards to the children, told a story corresponding to the cards, and asked the children to retell the story after removing the cards. The total scores of story grammar, MLC-w(Mean Length of C-units by words), and MLC-m(Mean Length of C-units by morphemes) were compared to determine differences in story retelling performance according to age. Results & Conclusion: The total scores for story grammar, MLC-w, and MLC-m significantly increased with age. The use of story grammar and MLC are considered effective measure of children’s story intelligibility. Implications for future study were discussed.