It is very important that the transportation of cargo to the destination safely and on time. Especially, we need careful attention to carriage of cargo in case of the long-distance and marine transportation under a lot of external effects relatively. The cargo is received the influence of the outside and it is likely to move by the force even if it was恥ed.To prevent transfer of cargo by the motion, we are securing the cargo with rope. But, a number of serious accidents has resulted from improper stowage and insufficient securing of cargo. Such an accident have occurred fatal damage to not only the cargo but also the ship. So, all operators must be reminded that only proper stowage and securing of cargos can prevent from the occurrence of such accidents in the future. First of all, we thought only so called roll and heave motions and derived mathematical equations to calculate the force of securing rope. And then, was measured a change of the rope tension and motion of simulator at time series. Finally, predicted the fluctuation tension of the rope in case of arbitrary initial tension and frequency using the measured data. Also, the results of prediction were verified through the experiment.

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