The phenomena of memory have been shown to come out early in life and to develop drastically for early childhood. Therefore, the purpose of this study were examine the development of memory of Korean children and also to see the memory span of Korean children. the subjects in this study were 80 children (male and female each 40 children) from age 3 to age 6. These subjects were devide into two age groups (3~4 age, 5~6 age). the stimulus materials were the numbers and the words. The numbers in this study were chosen from the number problems of WISC. The 42 words which consisted of two phonemes were selected. The number of items was 3 to 9 on the first through the last trial. altogether 14 trials, 7 trials for numbers and 7 trials for words, were given to each subject. Free recall method was sued. The following conclusions could be made. 1. The memory span of Korean early childhood increased as the age of the children increased. 2. The primacy effect was appeared when the age increased. Therefore, rehearsal was appeared as the age of the Korean early childhood increased.