NOVELTY - A fermenting bed for pig, comprising a pad groove, where inside of the pad groove is provided with pad made of organic material by ferment, is new.    USE - The fermenting bed is useful for keeping the pigs (claimed).    ADVANTAGE - If the fermenting bed is used for keeping pig, it can fast digest and decompose fecaluria and other excretion. Through suitable management and maintenance, having a flushing-free and an odorless pig pen can be achieved, thus is environment-friendly and can improve the economical benefit.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are: (1) a method for maintaining the fermenting bed by (i) managing ventilation of the pad by turning the pad uniformly by connecting thinning manure and adding water, where turning depth of the nursing pig is 15-20 cm and that of the improved pig is 25-35 cm; turning the pad for one time thoroughly in every 50-60 days and mixing the pad layer up and down uniformly, (ii) adjusting moisture by adjusting the moisture of the pad to make the water content maintained at 38045%, (iii) managing the thin manure by managing the thin manure of the nursing pig every 2-3 days, managing the thin manure of the medium and large pig every 1-2 days, (iv) adding bacterium, adding the fermenting fungicide comprising 5.0 x 108 to 1.0 x 1010 colony forming units (cfu)/mL Saccharomyces cerevisiae, 5.0 x 108 to 1.0 x 1010 cfu/mL Lactobacillus plantarum, 1.0 x 102 to 5.0 x 104 cfu/mL Mucor racemosus, and 5.0 x 103 to 5.0 x 104 cfu/mL Aspergillus oryzae, and (v) supplementing the pad and renewing it by supplementing the pad after 10% reduction of pad volume, mixing the new material with the pad on the fermenting bed, adjusting the moisture; cleaning the pad completely from the pad groove after Carbon/Nitrogen is less than 20, exchanging new pad; and (2) a method for keeping the pig using the fermenting bed by (i) keeping density, where the density of the nursing pig is 0.3-0.7 m2/pig and that of the improved pig is 0.7-1.5 m2/pig, (ii) sterilizing the pad; when the pig is moved to other fence or the growth pig is out of the fence, the pad is sterilized by piling fermenting method, (iii) management in midsummer; when the midsummer is coming, water content of the pad is reduced gradually, the moisture of the pad is gradually controlled to 35-38%; the pad is not turned in daily maintenance; only the surface pad and the fecalcuria are mixed uniformly in thin manure management; temperature is reduced by negative pressure ventilation or wet curtain or spraying, and (iv) feeding compound microorganism feed additive; adding it to the feed according to following ratio: feeding 1-1.2% to the nursing pig and 1.2-1.5 to the growth pig; or feeding pig after diluting for 400-500 times, feeding it at fixed time in each day, feeding one time in each day; where the fermenting fungicide comprises 5.0 x 108 to 1.0 x 1010 cfu/mL S. cerevisiae, 5.0 x 108 to 1.0 x 1010 cfu/mL L. plantarum, 1.0 x 102 to 5.0 x 104 cfu/mL M. racemosus, and 5.0 x 103 to 5.0 x 104 cfu/mL A. oryzae.