The research aimed to study microorganism in biological degradation of domestic garbage by domestic garbage disposal.[Method]Kitchen waste was collected,bacterial strains of the predominant bacteria in the degradation of assorted garbage and sorted garbage,and incidental microbial inoculums of domestic garbage disposal were cultivated and identified.[Result]The research identified 11 bacterial strains of origin microorganism;3 predominant bacterial strains of starch garbage degradation,respectively Bacillus subtilis(BDh9),miscellaneous bacteria(sta1) and Bacillus amyloliquefaciensB(BDh1);3 predominant bacterial strains of protein garbage degradation,respectively Bacillus subtilis(BDh9),miscellaneous bacteria(sta1)and Carnobacterium divergens(BD5);5 predominant bacterial strains of cellulose garbage degradation,respectively Bacillus subtilis(BDh9),miscellaneous bacteria(sta1),Burkholderia multivorans(BDh6),Bacillus circulans(BD1)and miscellaneous bacteria(sta2).[Conclusion] The study lays a foundation for researching patent technology for biodegradation of domestic garbage.