Abstract: Cellulose is one of the essential nutrients for ruminants and ruminants depend on rumen microbial degradate cellulose that they can not digest and use by themselves. The researchers hope that through a comprehensive and in-depth understanding of the processes of cellulose degradation in the rumen and information of related microoganisms to regulate rumen fermentation，finally improve animal performance. Therefore，the process of cellulose degradation in the rumen and related microoganisms is an important part of the study of ruminant nutrition. Now the study of individual strains of several species is more in-depth and the model of cellulosome has been established，but we lack the overall understanding of rumen microoganisms, and the study of fibrolytic ruminal microorganisms and enzymes still remain in the realm of theory. In this paper，we will discuss the process of cellulose degradation in the rumen and the major relevant microorganisms，focusing on fibrolytic ruminal microorganisms and the classification and structure of corresponding enzymes and the methods of solid-phase bacteria elution.

Key words: cellulose; rumen microoganisms; cellulose; cellulosome