Ultrasound is a non-conventional processing technology, which can be used not only for food preservation, but also to improve its properties and quality. This study evaluated the physical properties and stability of peach juice processed by the ultrasound technology. The peach juice processed by the ultrasound technology showed changes in its structure, evidenced by the optical microscopy and particle size distribution, involved steps of cell damage and release of intracellular content, particle size reduction, disruption of the whole cells, polysaccharide size reduction and dispersion of constituents. These effects, depending of the processing time, can trigger different mechanisms with a complex behaviour. The interaction among them and the relative importance of each one change during processing, determining the final rheological properties, pulp sedimentation and serum cloudiness (turbidity). 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