In this study, Dyneema fiber can bear tension and not easy to react with the chemicals characteristics, to explore for the resistance to bending moment and compressive strength of concrete. To compare with different rate of Dyneema fiber added at different ratio of AE water-reducing in the condition of concrete slump test and slump flow test. We planning in different water-cement ratio 0.48(non AE water-reducing)¡B0.4(add AE water-reducing), to test for its fresh properties and hardened properties, and discussion the effect by AE water-reducing and Dyneema fiber on the marine engineering. According to this study, adding Dyneema fiber will make the slump and slump flow value dropped, and affecting the workability. Because of Dyneema fiber will tangle when add too much Dyneema fiber in concrete. So in mixing time, the Dyneema fiber and concrete will form clumps, in this study, we add the AE water-reducing to improve. After we add AE water-reducing, the slump, slump flow, compressive strength, are increase, but we still had to pay attention to the ratio between Dyneema fiber and AE water-reducing, the strength of structure perhaps decrease if added too much Dyneema fiber or AE water-reducing. This study can get the best positive effect when added 1.5% volume volume of Dyneema fiber.