Nan yang yeast 2.577 is an important yeast in producing fuel ethanol. The effects of four factors including fungus age, enzymolysis temperature, enzymolysis time and enzyme concentration on the formation rate of Nan yang yeast 2.577 protoplast were studied. The highest value of Nan yang yeast 2.577 protoplast generation rate and regeneration rate were respectively summed up as follows: fungus age was 12 h, snail enzyme concentration was 2.0%, enzymatic hyd...