Cellulose, the main composition of the vegetal cell wall, exists widely in the nature and is the most abundant reproducible bio-polymer in the earth. In view of the high efficiency and the environment protection, the degradation catalysed with cellulase is the most effective way to hydrolyze cellulose thoroughly and causes no pollution. Cellulase can be extensively obtained, but except for some particular research, its production with other life-form but microorganism is unpractical, and the microbial ferme...