A method for normalizing blood vessels of lesions is disclosed, which includes administering an effective amount of oxygen-loaded microbubbles to a subject in need by intravenous injection, and projecting ultrasound from a ultrasonic emission device into the lesions for rupturing the oxygen-loaded microbubbles and releasing the oxygen to the lesions. Each of the oxygen-loaded microbubbles comprises oxygen and a water insoluble gas, and the particle size of microbubbles is 0.5˜20 μm.
