Abstract: In the case of external magnetic field, a series of physiological changes occur in the food material. The main mechanism is that the magnetic field changes the binding state of enzyme with water, also the magnetic field can affect the electron transfer in the respiratory metabolism of fruits and vegetables, which directly results in the decrease of respiratory metabolism, Magnetic field will lead to disturbance of microbial metabolic activity, reduce the corruption of food materials, and achieve the effect of keeping fresh. achieve the preservation of fruits and vegetables. In this paper, the influence of magnetic field technology on fruit and vegetable preservation was studied by using refrigerator as carrier, finally confirm the best condition of the magnetic field.

Key words: Magnetic field, Weight loss rate, Vitamin C, Respiratory intensity