NOVELTY - Decomposing straw comprises shattering raw materials into tiny particles; activating the compound bacterium which can decompose lignin after stirring uniformly with water; fully mixing the activating fermentation broth with raw materials; sealing the raw materials fully mixed with the activating fermentation broth and doing anaerobic fermentation for 2-3 days; and adding the compound bacterium which can decompose cellulose and hemicellulose into anaerobic fermented raw materials, doing anaerobic fermentation again; and sending out strong fragrance of distiller yeast with slightly sour-sweet.    USE - Method for decomposing straw (claimed) used in improving immunity of plants and animals.    ADVANTAGE - The method can handle diverse raw materials, decompose effectively, produce beneficial ingredients easy for animals and plants to absorb, and promote health growth of livestock; and has also simple operation, and can facilitate promotion and low treatment cost.    DETAILED DESCRIPTION - Decomposing straw comprises: (A) shattering raw materials into tiny particles in size of 1-2 cm; (B) activating the compound bacterium which can decompose lignin after stirring uniformly with water to make activating fermentation broth; where the compound bacterium which can decompose lignin comprises white rot fungi with cells of 90-110 million/ml, Kahn mold with cells of 90-110 million/ml, aspergillums with cells of 9-11 million/ml, penicillium with cells of 9-11 million/ml, branch spores with cells of 9-11 million/ml, verticillium spores with cells of 9 million-110 billion/ml, fusarium with cells of 9 million-110 billion/ml, and rhizopus with cells of 9 million-110 billion/ml; (C) fully mixing the activating fermentation broth with raw materials to make water more than 70%; (D) sealing the raw materials fully mixed with the activating fermentation broth and doing anaerobic fermentation for 2-3 days at normal temperature; and (E) adding the compound bacterium which can decompose cellulose and hemicellulose into anaerobic fermented raw materials, doing anaerobic fermentation again for 3-5 days; and sending out strong fragrance of distiller yeast with slightly sour-sweet. The compound bacterium which can decompose cellulose and hemicellulose comprises bacteria and actinomycosis. The bacteria comprise Paenibacillus, Pseudomonas spores, vibrio, Micrococcus, Streptococcus, clostridium, the original dry stick genus, fiber myxomycetes, macrophage fiber genus, genus heap capsule and spirochete; the actinomycosis is composed of nocardia, micromonospora strains and Streptomyces; cells concentration of each bacteria and actinomycosis is 9-11 million/ml.