Abstract: A bubble generating system includes a centrifugal pump which has a front frame and a rear frame, wherein a plurality of inlets are defined in the front frame and communicates with a center passage of the centrifugal pump. A water tank is connected with the centrifugal pimp and supplies water into the centrifugal pump. An air supplier has a plurality of supply pipes connected with the inlets so as to introduce high pressurized air into the centrifugal pump. A tub has a first pipe connected to nozzles of the tub and a second pipe recycles the water in the tub back to the centrifugal pump.