This research is a case study with the subject of 5th grade elementary students, practice a developmental bibliotherapy, and check the influence on the self-actualization. The subjects of this research is 20 students of 5th grade C elementary school in Gyeonggi Province, (including experimental group.10 students, control group: 10 students) and we practiced 12 times for 6 weeks. The result of the experimental group represents meaningful effects in the scales of inner-directed, self-actualization value, feeling reactivity, spontaneity, self-regard, self-acceptance. Then, we found in the lasting scale that the effect was lasting after 3 weeks. Therefore, we conclude that a developmental bibliotherapy can gives elementary students a positive influence, and help them form their proper notion as human being.