The major purpose of this study was to explore the learning outcomes on marine education for 3rd graders in Taipei. A quasi-experimental design with a single group was used in this study. Students in the experimental group (N=56) were given eight weeks of marine education activities and a one-day field trip at Tamsui River & Estuary Park in New Taipei city. Two research instruments were used in this study, including a Marine Education Achievement Test and an Attitude towards Marine Education Scale. The results were obtained by t-test analysis. The results of this study were (1) the Marine Education Achievement Test showed students in the post-test achieved higher scores than in the pre-test (t = 14.21, p < 0.001); and (2) the Attitude towards Marine Education Scale showed students in the post-test had higher scores than in the pre-test (t = 4.28, p < 0.001). Therefore, it can be concluded the marine education activities and field trip were effective for 3rd graders' learning on marine education in this study.