TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: Catalyzing reduction reaction of organic substance via plant biological catalyst comprises: (a) putting the plant biological catalyst in the magnetic field to be magnetized under the condition of controlling the magnetic induction intensity and magnetic processing time to obtain a magnetized plant biological catalyst; (b) adding the magnetized plant biological catalyst to the reaction solution with substrate to form a magnetized plant catalyzing reaction system; (c) putting the magnetized plant catalyzing reaction system in an oscillation device to oscillate and culture so that the magnetized plant catalyzing reaction system is catalyzed to obtain the reaction product; and (d) separating and extracting the reaction product to obtain the purified reaction product. Catalyzing reduction reaction of organic substance via plant biological catalyst comprises: (a) putting the reaction solution with substrate in the magnetic field to be magnetized under the condition of controlling the magnetic induction intensity and magnetic processing time to obtain a magnetized reaction solution with substrate; (b) adding the plant biological catalyst to the magnetized reaction solution with substrate to form a magnetized plant catalyzing reaction system; (c) putting the magnetized plant catalyzing reaction system in an oscillation device to oscillate and culture so that the magnetized plant catalyzing reaction system is catalyzed to obtain the reaction product; and (d) separating and extracting the reaction product to obtain the purified reaction product. Catalyzing reduction reaction of organic substance via plant biological catalyst comprises: (a) putting the plant biological catalyst and the reaction solution with substrate in the magnetic field to be magnetized under the condition of controlling the magnetic induction intensity and magnetic processing time to obtain a magnetized plant biological catalyst and a magnetized reaction solution with substrate; (b) adding the magnetized plant biological catalyst to the magnetized reaction solution with substrate to form a magnetized plant catalyzing reaction system; (c) putting the magnetized plant catalyzing reaction system in an oscillation device to oscillate and culture so that the magnetized plant catalyzing reaction system is catalyzed to obtain the reaction product; and (d) separating and extracting the reaction product to obtain the purified reaction product. The plant biological catalyst comprises plant and its culture, where the plant is the whole plant or its part, where plant part is plant cell, plant tissue, plant organ, plant embryo, or plant protoplasm, and the plant culture is plant callus, isolated cell, isolated organ, isolated plant regrowth, or isolated embryo. The plant organ is root, stem, leaf, fruit, or seed of plant. The substrate is organic substance such reducer of carbonyl compound. The reducer of carbonyl compound is beta-ketonicester reducer, acetophenone reducer, alicyclic ketone reducer, or open chain aliphatic ketone reducer. Controlling magnetic induction comprises magnetic induction controlled at 0.006-10 Tesla, and the controlling magnetic processing time is 1-500 minutes. The oscillation device is shaker, shake flask cabinet, oscillation culture case, or oscillator.