[目的]筛选高效降解木质素的菌种。[方法]通过马铃薯琼脂平板培养、马铃薯液体摇瓶培养和变色反应,对采自吉文山枯木中的木质素降解菌进行了筛选,并对其降解构树的卡伯值和纤维素进行了测定。[结果]共筛选出3 种对木质素降解能力较强的菌种,分别为JWS-1、JWS-2 和向日葵菌核病菌。[结论]为进一步研究生物制浆奠定了基础。 [Objective] The research aimed to screen the bacteria that degraded lignin efficiently. [Method] The lignin - degrading bacteria collected from the dead wood of Mt. Jiwenshan were screened by potato agar plate culture, shake flask culture and discoloration reaction of potato, and the kappa number and cellulose of its degenerated tree were measured. . [Result] Three strains of JWS-1, JWS-2 and Sunflower sclerotinia were screened for their ability to degrade lignin. [Conclusion] This laid the foundation for further study of bio-pulping.