NOVELTY - An agaricus bisporus focus bi-time fermentation involves 1) preparing fermentation culture medium by mixing raw material composed of grass (45-60 pts.wt.), chicken manure (35-50 pts.wt.), gypsum (2-8 pts.wt.), and oil cake (3-10 pts.wt.), fermenting for 4-6 days, filtering fermented material, 2) fermenting the base material of the first tunnel yeast uniformly to the ventilating floor in a fermentation tunnel, controlling fermentation temperature by fan operation, including balance stage, heating stage, sterilizing, cooling, constant temperature, cooling and discharging.    USE - As agaricus bisporus focus bi-time fermentation method (claimed).    ADVANTAGE - The method overcomes the deficiency of the existing technology, has centralized high efficiency, good quality and high yield, allows energy saving and is environment-friendly.    DETAILED DESCRIPTION - An agaricus bisporus focus bi-time fermentation method involves 1) preparing fermentation culture medium by mixing the raw material composed of grass (45-60 pts.wt.), chicken manure (35-50 pts.wt.), gypsum (2-8 pts.wt.), and oil cake (3-10 pts.wt.), uniformly paving fodder in the pre-wet tank, pre-wetting for 2-5 days, piling grass materials for 12 hours, adding chicken manure, gypsum and oil cake, fully mixing uniformly, standing for 12 hours, filling the ferment materials for first time fermentation in ventilating floor tunnel, the fodder evenly scattering is filled, filling fermented material with width of 5 m and the height of 3 m; transporting through the fan fresh air into the fermented material, fermenting for 4-6 days, filtering the fermented material into the other fermenting for the first time, turn once every three days positions, switch positions 3-4 times throughout the fermentation time is 12-15 days; 2) fermenting the base material of the first tunnel yeast uniformly to the ventilating floor in a fermentation tunnel, where the feeding high is 2-3 m, fermentation time is 5-9 days, controlling fermentation temperature by the fan operation, comprising a balance stage, heating stage, sterilizing, cooling, constant temperature, cooling and discharging; in the balance stage: time is 8 hours, fermentation temperature is 48-50 degrees C, air temperature is 47 degrees C, raising temperature stage: time is 8-12 hours, fermentation temperature is 57 degrees C, air temperature is 56 degrees C, the pasteurization sterilizing time is 8 hours, fermentation temperature is 57 degrees C, air temperature is 56 degrees C, and the time is 4 hours, fermentation temperature is reduced to 50 degrees C, air temperature is reduced to 48 degrees C, constant temperature time is 4 to 6 days, the fermentation temperature is 48-50 degrees C, air temperature is 47 degrees C; cooling and discharging, where the time is 6 hours, and the temperature of material is reduced to 25 degrees C from 48 degrees C. The fodder is prepared by mixing the following components according to weight ratio: wheat (80-90 pts.wt.), and straw (10-20 pts.wt.).