NOVELTY - A fermentation process comprises that an organic substance (40) is accumulated in a preset space, a protection sheet (10) which covered accumulated organic substance is removed after a predetermined period, the organic substance is stirred and is covered by the protection sheet, and the organic substance is decompose-treated by aerobic fermentation.    USE - The method is used for fermentation processing of an organic substance.    ADVANTAGE - An organic substance in the installation space is efficiently fermented by wrapping with a protection sheet, such as, a Gore-tex (RTM) sheet.    DETAILED DESCRIPTION - A fermentation process comprises that an organic substance (40) is accumulated in a preset space, a protection sheet (10) which covered accumulated organic substance is removed after a predetermined period, while using an aeration waterproof sheet having air permeability and waterproofness as a protection sheet, the organic substance is stirred and is covered by the protection sheet, and the organic substance is decompose-treated by aerobic fermentation.    An INDEPENDENT CLAIM is also included for the organic substance fermentation processing apparatus (1). The organic substance is accumulated in a predetermined place and covered with a protection sheet. The organic substance is decompose-treated. The fermentation processing apparatus comprises an installation surface (2) for accumulating the organic substance and a protection sheet for covering the surface. The apparatus further comprises a fixing tool for fixing the circumference portion of the protection sheet, so that the protection sheet is prevented from floating up from the installation surface. An air supply unit is provided to supply air in the organic substance accumulated space divided with the installation surface and the protection sheet.    DESCRIPTION OF DRAWING(S) - The figure shows an outline block diagram of the organic substance fermentation processing apparatus.    Fermentation processing apparatus (1)    Installation surface (2)    Chimney (3)    Protection sheet (10)    Organic substance (40)