This paper presents the full-scale comparative trial results of two different types of propeller, i. e. a conventional propeller and a highly skewed propeller which were fitted on the same existing ship one after another. After analyzing the measured data, it is concluded that in comparison with the conventional propeller, the use of the highly skewed propeller could reduce the 1 st blade frequency component of the pressure fluctuations on the surface of the after body and amplitude of vertical acceleration on the steering deck to 60% and 80% respectively, and also reduce the 1 st blade frequency component of torsional and axial stress at the intermediate shaft to 17%-46%. It is also found that as compared with the propeller exciting forces, the exciting forces induced by the main engine have more influence on the horizontal hull vibrations.