The invention relates to a method for solving a problem of bacterial variation degradation of liquid-strain
nutrition liquid, in particular to a method for
mushroom-liquid liquid strains. The method comprises a step of using an efficient mutagenic agent, wherein the efficient mutagenic agent comprises
itraconazole and rapamycin, and the weight percentage of the
itraconazole and the rapamycin in the
nutrition liquid is respectively 0.5-5 percent and 1-7 percent. The method also comprises a step of low-temperature preservation strain, a step of adjusting culture conditions and a step of separation and purification. The method taking the
itraconazole and the rapamycin as the efficient mutagenic agent as the core method, the
mutagenesis is mild, and meanwhile, the strain preservation condition, the nutritional condition of the
nutrition liquid, the passage number condition, the purification condition and the like are optimized. Experiments prove that the problem of bacterial variation degradation of various kinds of
mushroom liquid-strain nutrition liquid can be basically solved, the method has an obvious economic value, and high-producing strain is obtained.