To investigate the working performance of structured-packing columns on offshore floating platforms, the effects of different typical ship motions on the mass-transfer area of a column with M250X structured-packing were measured with an Air-NaOH system. A pilot-scale column with an 800 mm diameter was adopted, and tilt, roll, heave and sway motion were mimicked by a six-degree-offreedom parallel platform. The mass-transfer area was affected differently for each type of motion depending on the operating conditions. Therein, the gas velocity was the key factor that the mass-transfer area was more likely to decrease with a high gas velocity in all cases. For typical motions, their influences on the mass-transfer area were different, which were associated with moving periods. (C) 2019 Elsevier Ltd. All rights reserved.