Ocean energy is an important marine resource and clean energy. Its development and utilization has become necessary requirements of national development strategy. Ocean energy test site can give the grid-connection test in real sea state for ocean energy devices, this is the key link for ocean energy devices transforming from engineering prototypes into scale industrialization applications. Large-scale wave energy and tidal current energy test site construction and operation conditions are introduced in this paper and a brief comparative analysis is also given; developing status and related technologies on ocean energy power generation test site in China are also discussed. And then, this paper investigated the necessity of grid-connection test on ocean energy generation,and pointed out that the construction of ocean energy test site is a way to ensure efficient use of our ocean energy resources.