中国是一个人口大国，人口数量巨大的同时，伴随着大量的卫生纸消费，而这些消费的卫生纸，最终都会转变成生活垃圾。这些纤维素类废物填埋土壤中自然降解进程长，燃烧又会给环境造成巨大的伤害。纤维素分解菌是自然中广泛存在的可以分解纤维素的一类微生物，其中由于纤维素降解真菌产酶量大且产生的纤维素酶分泌到细胞外，因而目前对纤维素降解真菌的研究较多。 本实验以羧甲基纤维素钠作为唯一碳源，在土壤中分离出九株纤维素分解真菌，用DNS法对其发酵产生的纤维素酶进行酶活的测定，并利用该酶对卫生纸进行降解，为卫生纸的降解提供了一个可实践的思路。

China is a country with a large population. Huge amounts of people result in the tremendous consuming of toilet tissue, which is finally turned into household refuse. Garbage of cellulose takes long to be degraded if buried into soil and enormously harm the environment if burned. Cellulose-decomposing microbe is a kind of creature existed commonly in nature that can decompose cellulose, among them is the cellulose-decomposing fungus which secrets cellulase and releases it out of its cell. Therefore, it is widely studied. In this experiment, nine strains of cellulase-producing fungi are isolated from soil using Sodium Carboxymethyl Cellulose(CMC-Na) as the sole carbon and energy source. After fermentation, cellulase activity is measured. Finally the cellulase acquired during fermentation are used to degrade toilet tissue, providing an idea for the degradation of toilet tissue.