TECHNOLOGY FOCUS - BIOLOGY - Preparation (Claimed): Preparation of (I) comprises (a) preparing several plastic culture discs with length of 30-60 cm, width of 20-30 cm and depth of 2.5-4 cm and a sprayer, a metering scale, a plastic barrel, a package bag, a gauze, a hygrothermograph and a pH measuring apparatus, (b) preparing rice bran or bran as culture backing material, where the rice bran or the bran is fresh and dry and has no mildew, the fineness is less than or equal to 0.2 mm, taking sugar and vinegar as accessory, where the sugar can be brown sugar, sugar cane and glucose, (c) weighing rice bran (2-5 kg) to the proportions of rice bran (100 kg), sugar (1 kg), vinegar (0.5 kg) and strain (2 kg), adding water to agitate and adjust the water content to be 38-42%, and then evenly mixing with the strain to form the bacterial material A, adding the sugar and vinegar into water (2-5 kg) to prepare the sugar vinegar liquor B, laying the residual rice bran on the cement or plastic film, weighing the required water to the water content of 38-42%, adding B to agitate evenly, and then spraying the mixture on the rice evenly by using the sprayer, spraying and agitating, and then scattering the material A, evenly agitating, adjusting the pH value to be 5-7 to form a mixed material C, stacking for 1-2 hours and making the rice bran to absorb water adequately, (d) packing the C into the plastic dish, where the thickness of the C around the dish is 3 cm and the thickness of the middle part is 2.5 cm, covering the wet gauze, guaranteeing that the culture medium is not naked and then stacking the plastic dish packed with the material C into the disinfected culture chamber in well shape, where the height is 6-8 layers, and then inserting the thermometers in the upper, middle and lower discs respectively and hanging the hygrothermograph in the chamber, (e) culturing and fermenting in three stages comprises controlling the temperature of the culture chamber to be 30-32 degrees C, where the temperature is not smaller than 25 degrees C, controlling the humidity to be 90-95%, heating up the temperature of the material in the disc to be more than 35 degrees C, controlling the temperature of the culture chamber to be 35-38 degrees C, controlling the material temperature to be 40-45 degrees C and controlling the humidity to be 85-90%, culturing for 48 hours in the stage, where the material surface has white hypha, and then exchanging the positions of the upper and lower discs and guaranteeing that the hypha is grown evenly, and when the culture material hypha in the disc is blocked firmly, and the material temperature is not heated up and begins to descend, radiating in time, cooling the material temperature to 33-34 degrees C, controlling the humidity to be 70-75%, culturing and fermenting for 4-5 days in summer and for 7-8 days in winter, (f) fermenting and culturing the mixed material C to obtain the Mycoplasma, after airing and crushing the D, and obtaining the organic matter rotten fungicide, (g) detecting each batch of fungicide product, where the effective active bacterium content reaches 0.05-0.1 billions per unit/g, the fineness is less than or equal to 0.2 mm, the water content is not greater than 20%, the pH value is 5.5-7.5 and the product has liquor flavor, and (h) using the nontransparent plastic bag to package, where each bag is 0.5-2 kg, placing the plastic bag under the dry, ventilating, and storing in cold environment, where the quality guarantee period is 6 months. Preferred Composition: The preferable combination of composite microbial flora comprises Actinomycetes (50 parts), Saccharomycetes (10 parts), lactic acid bacteria (10 parts), Bacillus (15 parts) and photosynthetic bacteria (15 parts).