Marine energy utilization engineering is one of main issues in the field of harbor, coastal, and offshore engineering. This paper reviews recent advances in investigation and evaluation of energy resources, energy conversion technology, and demonstration projects. Key scientific and technical problems for innovative structures, the safety and stability of structures and foundations, the impact on sea water and sediment environment, the conversion rate, and the grid connection technique, which need to be further studied and practiced, were study emphases as they remain difficulties in large-scale utilization of marine energy.