NOVELTY - Biology pre-treatment method for removing and absorbing effluvium of organic effluvial castoff, by using aerobic bacterium, or mixed material, organic effluvial castoff containing wastes from poultry and animal, living rubbish, industrial biomass rubbish, living mud and industrial mud, conditioner, excrement, catalyst, where the processing method involves adding and mixing aerobic bacterium or mixed material, organic effluvial castoff, and conditioner with excrement, and pouring catalyst at the same time.    USE - The method is useful for removing and absorbing effluvium of organic effluvial castoff and twin shaft mixer (claimed).    ADVANTAGE - The method shortens the fermentation time of compost, absorbs and separates effluvium, depress effluvial gas sol, accommodates moisture, raises the activeness of many microbe enzyme, shortens the fermentation period of compost, improves the effect of treatment and the quality of compost, and transform the organic effluvial castoff for recycling.    DETAILED DESCRIPTION - Biology pre-treatment method for removing and absorbing effluvium of organic effluvial castoff, by using (in vol. pts) aerobic bacterium (1-7) processed at high temperature (50-70 degrees C) aerobic ferment refluence compost, or mixed material (1-7) processed at 23-45 degrees C middle temperature epiphyte, organic effluvial castoff (1-7) containing wastes from poultry and animal, living rubbish, industrial biomass rubbish, living mud and industrial mud, conditioner (1-7), excrement (0-20), catalyst (0-5 wt.%), where the processing method involves adding and mixing aerobic bacterium or mixed material, organic effluvial castoff, and conditioner with excrement, and pouring catalyst at the same time, where the parameter of the mixed materials is maintained at the pH 6-8, and the C/N value is 20-351, C/P is 30-1201, and moisture is 40-65 (wt.). An INDEPENDENT CLAIM is included for twin shaft mixer used in biology pre-treatment method, where one side of its upper has inlet in mouth, the other side of the lower has reclaiming mouth, and two parallel mixing axes in the mixer, the rotating directions are outward and opposite, there are 10-30 pieces ordered awes on every axes, which is arranged in the angle of 15-30 degrees C and is middling width, the narrow width is in the angle of 30-45 degrees C and the broad width is in the angle of 45-60 degrees C, the mixing time of the awe and mixer must is greater than or equal to 10 seconds, the evenness of the mixing CV is less than 10%.