NOVELTY - Preparing starting material for organic fertilizer involves (a) diluting deodorant and effective microorganism (EM) bacterial liquid, (b) piling sewage sludge and spraying diluted deodorant and EM bacterial liquid, (c) processing sludge and spraying bacterial liquid, (d) fermenting pile in controlled temperature and turning pile while fermentation, (e) drying and crushing fermented product, and (f) preparing starting material for organic fertilizer by mixing dried product and sewage sludge, piling mixture and spraying bacterial liquid and deodorant.    USE - The method is useful for preparing starting material for organic fertilizer (claimed) which is useful for improving soil.    ADVANTAGE - The starting material for organic fertilizer makes soil loose and soft, and promotes growth of garden based flowering plant.    DETAILED DESCRIPTION - Method for preparing starting material for organic fertilizer involves (a) diluting deodorant with water in a volume ratio of 1:150, mixing effective microorganism (EM) bacterial liquid and sterile water in a volume ratio of 1:200 to obtain bacterial liquid, and mixing EM bacterial liquid (A) and sterile water in a volume ratio of 1:100 to obtain bacterial liquid (B), (b) placing sewage sludge in production shed and piling sludge with thickness of 15-20 cm, rotary spraying diluted deodorant for 5-6 times/day for 2-3 hours, rotary spraying EM bacterial liquid (A), where 100-200 kg EM bacterial liquid (A) is sprayed/ton sludge, (c) processing sludge for 7-9 days until moisture content of sludge reaches 85-90 %mass and decreases to 50-60 %mass, rotary spraying bacterial liquid (B), where 100-200 kg EM bacterial liquid (B) is sprayed/ton sludge, piling sludge with 2 m width and 1.4-1.5 m pile height, (d) fermenting pile, monitoring temperature and pile water content, controlling temperature in a range of 70-75 degrees C and detecting temperature continuously, turning pile when temperature drops to 60-65 degrees C and fermenting continuously, (e) turning pile for 3-4 times and controlling moisture content to 32-37 %mass, rotary drying fermented product for 3 days until moisture content is decreased to 18-20 %mass and crushing dried product, and (f) preparing starting material for organic fertilizer by mixing dried product and sewage sludge in a mass ratio of 1:2, where the mixture has moisture content of 50-60%, piling mixture with 2 m width and 1.5 m height, spraying 100-200 kg EM bacterial liquid (B) and 50-100 kg deodorant to 1000 kg mixture, treating mixture for 14-16 days and crushing mixture into 50-55 mm.