In order to investigate the wake distribution of full ships, the measurements of the flow around the sterns of a ship and its model were carried out with five-hole pitot tubes. On the ship, a 200, 000 D. W. T. tanker, the measured section was situated at about 4. 5% of L_pp forward from A. P., and on the model some other sections were added besides the corresponding one. The pressures through the five-hole pitot tubes were measured by using the auto-balancing pressure transducers and the digital record system. From the experimental results it was confirmed that the complicated flow, so-called stern vortex, existed in the ship wake as well as in the model wake and the method to estimate the wake distribution of a ship from that of the model, which Dr. Sasajima had presented, was good for such a full ship. Moreover, when applying this method to the estimation of the directions of flow in the ship wake, the estimated directions of flow were in considerable agreement with the experimental values.