NOVELTY - Processing organic wastewater by bacteria for wastewater treatment containing Bacillus bacteria, by (1) adding 1st bacteria for wastewater treatment, containing Bacillus bacteria with high decomposition ability, into processing tank, (2) acclimatizing bacteria for wastewater treatment containing Bacillus bacteria within processing tank, such that the bacteria adapts to organic wastewater, (3) diagnosing bacteria based on number and decomposition ability, (4) isolating and culturing bacteria, and (5) adding bacteria for wastewater treatment.    USE - The method is useful for processing organic wastewater by the bacteria for wastewater treatment containing Bacillus genus bacteria (claimed), where the organic wastewater includes organic matters, such as human waste, sewage, foodstuffs wastewater, livestock farming wastewater, pulp wastewater and pigment wastewater.    ADVANTAGE - The method enables to improve the quality of the treated water, sludge generation amount and electric power usage-amount, with the reduction of unpleasant odor by easily, stably and efficiently.    DETAILED DESCRIPTION - Method of processing an organic wastewater by the bacteria for wastewater treatment containing Bacillus genus bacteria, involves (1) adding 1st bacteria for wastewater treatment, containing Bacillus bacteria with high decomposition ability, into processing tank, (2) acclimatizing bacteria for wastewater treatment containing Bacillus bacteria, within processing tank, such that the bacteria for wastewater treatment with high decomposition ability adapts to organic wastewater, (3) diagnosing the bacteria for wastewater treatment that had adapted to the organic wastewater, based on number of bacteria for wastewater treatment in the processing tank and decomposition ability of the organic matter of the bacteria for wastewater treatment, (4) isolating bacteria for wastewater treatment containing Bacillus genus bacteria with high decomposition ability which had adapted to organic wastewater based on the diagnosis from the processing tank, and culturing the bacteria for wastewater treatment with high decomposition ability that adapted to the organic wastewater in a laboratory culture tank, (5) adding the bacteria for wastewater treatment, containing Bacillus bacteria with high decomposition ability which had adapted to cultured organic wastewater, to the processing tank, where the process of (2)-(5) is performed repeatedly, and the bacteria for wastewater treatment containing Bacillus genus bacteria with high decomposition ability are stored up into a processing tank.