TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Component: The high concentrated organic matter-decomposing inoculant microbial inoculum comprises lactic acid bacteria, acetic acid bacteria, Bacillus, microzyme, photosynthetic bacteria, or Actinomyce. Preferred Method: The high concentrated organic matter-decomposing inoculant microbial inoculum is prepared using aseptic physiological salt water to wash a bacterium-keeping inclined surface; uniformly shaking in a sterile triangular flask to obtain 200 mL bacteria suspension liquid; inoculating the culture substance to the inclined surface according to 10% of the volume; culturing the bacteria at 37 degrees C and 180 revolutions/minute (rpm) for 12 hours; culturing mold at 28 degrees C and 220 rpm for 48 hours; inoculating 5% seed liquid, and culturing for 48 hours to obtain a fermentation liquid; mixing strain of ferment liquid with the sterilizing bran at a ratio of 1:1 for 24-72 hours, and drying to prepare solid microbial inoculums; and mixing the solid microbial inoculums comprising lactic acid, acetic acid bacteria, Bacillus, microzyme, photosynthetic bacteria, and Actinomycete at a mass ratio of 1-2:0.5-0.8:1-2:1-2:0.5-0.8:1-2. The viable bacteria in the high concentrated organic matter-decomposing inoculant microbial inoculum comprises 25-30 billion/g lactobacillus, 15-25 billion/g acetic acid bacteria, 25-30 million/g Bacillus, 25-30 million/g microzyme, 5-15 million/g photosynthetic bacteria, and 5-15 billion/g Actinomycete. The functional composite microbial inoculum comprises Azotobacter, Bacillus, phosphobacteria and potassium bacteria, photosynthetic bacteria, microzyme, or Pseudomonas. The functional composite microbial inoculum is prepared by inoculating the strain in a nutrient substance containing an inclined surface in a triangular bottle containing 200 mL culture medium; culturing bacteria at 37 degrees C at 220 rpm for 12 hours to obtain a primary seed liquid; culturing at 28 degrees C at 220 rpm for 48 hours to obtain a primary seed liquid; inoculating 10% seed liquid in a seed tank, and culturing bacteria for 8-10 hours at 37 degrees C or fungus for 20-24 hours at 28 degrees C to obtain second seed liquid; inoculating 5% culture medium in the fermentation tank to ferment, stirring at 150-200 rpm, where the culturing bacteria temperature is 37 degrees C; where ventilation volume is 1:0.3-1:0.5, and the tank pressure is 0.2-0.3 MPa; mixing the solid microbial inoculums according to mass ratio of lactic acid to acetic acid bacteria to Bacillus to microzyme to photosynthetic bacteria to Actinomycete is 1-2:0.5-0.8:1-2:1-2: 0.5-0.8:1-2; concentrating; and taking the mixture according to mass ratio of rice bran to bran is 1:1 as carrier, adsorbing, mixing, and condensing the ferment liquid. ACTIVITY - Fertilizer.