The purpose of this study is to analyze the improvement of marine environmental awareness and attitude by developing a marine environmental education program for fifth and sixth graders of elementary school. Accordingly the marine environmental education textbook developed by the national institution and the prior studies relating to marine environment for elementary school students were analyzed. Based on the analysis, programs with 13 sessions of seven subjects in four stages of planning, design and verification, application, and evaluation were developed. The programs were applied to a class of fifth grade students using creative experience activity time through a single pre- and post-test design. The results of this study are as follows. First, a list of ideas was prepared based on the analysis of the previously developed marine environment textbook, and subsequently the marine environmental education program was developed by selecting program subjects and activities. Second, the comparison of pre- and post-test through the questionnaire indicated that the program has a statistically significant effect on the marine environmental awareness and attitude of elementary school students. Third, in the results of qualitative analysis through the results of activities and testimonies, the marine environment education program revealed the students willingness to practice, display interest in the marine environment, and an attitude to participate in practices for preserving the marine environment. In conclusion, the program developed in this study was suitable for the level of elementary school seniors, and was effective in encouraging elementary school students interest in the marine environment and participation in the conservation of the marine environment. Therefore, this study is meaningful in that it has developed a program to utilize marine environment education in actual classes, where related classes are rarely conducted in elementary school curriculum and educational fields.