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The present research aims at experimentally clarifying the effects of freak wave on the motion and dynamic responses of a semisubmersible.To reveal the effects of mooring stiffness, two mooring systems were employed in the formal tests.The 6-dof motion responses and mooring tensions have been measured and the 3-dof motions of fairleads were calculated as well.From the time series, trajectories and statistics information, the interactions between the freak wave and the reference semisubmersible have been demonstrated and the effects of mooring stiffness have been identified.Experimental results show that the freak wave is likely to cause large horizontal motions for soft mooring system and to result in extremely large mooring tensions for tight mooring system.Therefore, the freak wave is a real threat for the marine structure, which needs to be carefully considered at design stage.