Objective : This study suggests the available method of sea-rescue-measure by the flow analysis for the warship even though it is in charge of operation. Method : The Kriso Ship has been analysed for the investigation in which the WAVIS commercial code including the level-set method is used. The Reynolds averaged Navier- Stokes equation is used for the governing formula, and the k-epsilon model is for turbulence. The GRIDEN code is applied for the grid generation. Results : The up-and-down fluctuations are repeatedly found three-times in the wave height along the hull. The bow region is dangerous in the sea-rescue-measure because of rapid flow speed, while the midship shows outward and low speed. Around the stern, it is extremely dangerous because of the circulating propeller. Conclusion : The flow analysis shows the result that the stern is extremely dangerous, and the lifeguard equipments & safety devices should be arranged near the stern, if possible. And when the rescue team approaches from the rear of propeller, it is advantageous to have an access to left-handed side. The fluctuation of wave height, with a peak and bottom three-times along the hull, provides further information on the sea-rescue -measure.