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The deck area of a ship uses a variety of mechanisms and especially, for handling heavy materials, such as a Windlass, a Davit and a Derrick, a Winch for a deck, which controls by winding a drum with a wire or a rope is mostly used. Since the winch mainly uses a hydraulic system depending on driving characteristics, load-based power consumption is the most important device for this method. Therefore, an experimental study on the effect of energy reduction resulting from the flow rate variation was conducted by applying an inverter control to the deck winch, which is being used in a real training ship. As a result, when the surrounding environment and the driving condition were equal to each other, the maximum reduction and the minimum reduction in power consumption resulting from the flow rate variation excepting the maximum flow rate conditions was 51.8% and 16.1% respectively.