对筛选的自生固氮菌和纤维素分解菌进行混合培养，研究了菌数与菌液含氮量的变化情况，并与各单独培养进行了比较。实验证明：在混合培养条件下，两种菌能相互利用、相互促进，混合培养液的菌数增加，固氮菌的固氮能力提高。这两种菌可混合培养制成混合菌剂。 The selected autotrophic bacteria and cellulolytic bacteria were mixed culture, the changes of the number of bacteria and nitrogen content of bacteria were studied, and compared with each culture alone. Experiments show that: under the mixed culture conditions, the two bacteria can use each other, promote each other, the number of mixed culture broth increased, nitrogen-fixing bacteria increased nitrogen fixation capacity. These two kinds of bacteria can be mixed to make mixed bacteria.