In this paper, an experimental system is established to measure the resistance of a supercaviating submerged body and to observe its shape of supercavitation. The experiment is performed for a disk cavitator at different cavitation numbers and ventilation conditions. From the experiment, a stable and transparent supercavitation bubble between the submerged body and water can be observed and the drag of the submerged body is decreased to 28% of its original value in ventiated supercavitation conditions. And the drag of the body keeps constant when the quantity of the ventilated air is over a certain amount.