This paper presents a study on the kinetics of dehydration of carrot parallelepipeds which may be useful for a new method which consists in applying a freezing pretreatment. followed by a vacuum dehydration after sample defreezing.allowing instant products to be produced in terms of rehydration ( about 2 minutes rehydration). in this paperare examined effects of effects of pressure (2.6 to 75 kPa). heating conditions (single and double face heating), temperature (50 to 100°c) and sample thickness (3 to 20 mm thick) on dehydration rate.