Abstract: The visualized study was carried out involving the transportation and breakup process in a Venturi-type bubble generator. The air and water were used as working fluids with volumetric flow rates of 15-20 m³/h and 0.6-0.7 L/min, respectively in experiment, resulting in a void fraction in the range of 0.2%-0.3%. The results show that being different from that of a conventional channel, bubbles are decelerated rapidly after flowing out of the throat for Venturi tube, leading to a larger difference of velocities between the gas and liquid. This must have a significant effect on the deformation and breakup of bubbles. The water flow rate has little effect on the position of bubble breakup which is always at a distance from the throat about 8-10 mm and near the boundary between the vortex region and main stream.