NOVELTY - Method for cultivating mushroom, involves (a) obtaining sawdust, soybean, mushroom tang, lime and gypsum, (b) adding water to mushroom tang particles, soaking the mixture at room temperature, extracting the mixture, adding other raw materials into the mixture, piling the mixture, maintaining the stomatal density of the mixture, covering the mixture with grass, naturally fermenting, maintaining the temperature, adding lime and gypsum, fermenting, and cooling the fermented mixture, and (c) harvesting the mushroom depending on mycelial growth.    USE - The method is useful for cultivating mushroom (claimed).    ADVANTAGE - The method promotes breeding of beneficial microorganisms and growth of the branched oyster mushroom mycelia, improves microbial flora in the material, and accelerates catalytic decomposition of the cultivation material, provides high biotransformation rate, saves labor, coal and other resources, and is environmentally-friendly.    DETAILED DESCRIPTION - Method for cultivating mushroom, involves (a) obtaining 78-86% sawdust, 10-12% soybean, 3-4% mushroom tang, 2-3% lime and 1% gypsum, where the diameter of the sawdust is 3-5 mm, and the mushroom tang is shiitake mushroom, (b) adding 20-30 times water to mushroom tang particles, soaking the mixture at room temperature for 18-24 hours, extracting the mixture, adding other raw materials into the mixture, piling the mixture at a height of 1-1.2 m and width of 2-3 m, maintaining the stomatal density of the mixture at 1/m3, covering the mixture with grass, naturally fermenting the mixture, maintaining the temperature of the mixture at 60 degrees C for 24 hours, adding lime and gypsum to the mixture, fermenting the mixture, maintaining the moisture content of the mixture to 63-65%, and cooling the fermented mixture, and (c) harvesting the mushroom depending on mycelial growth, where the mushroom tang particles are prepared by adding 20 times water to the mushroom, extracting the mixture at room temperature for 18-24 hours, filtering the extract, adding water, and preparing mushroom tang extract.