With the rate of cellulose and sugar yield as the main standard，main cellulose degradation bacteria of each composing stage were selected and its regulatory mechanism was studied preliminarily.The results showed that cellulose was decomposed and converted into compost organic matter，part of which was decomposed into sugar and other small molecular substances.In the early stage of compost，the sugar production was relatively large，which played an important role in promoting the fermentation of microbial growth and compost temperature.In the later period of compost it was changed into the compost organic matter，which played an important role in forming humus in composting.Cytophaga bacteria，Pseudomonas,Micromonospora，Cellulomonas fimi，Fiber vibrio，Bacillus，Thermophilic actinomycete，Micropolyspora，Streptomyces，Aspergillus，Micromonospora，Trichoderma，Penicillium，Aspergills and Bacillus were respectively the main cellulose degradation bacteria in the low，middle，high and cooling temperature stages.It was of great application value to put the degradation rate of cellulose and sugar yield as the main index for research and screening of cellulose degrading bacteria.