Cellulase-producing fungus T1-2 and protease-producing bacterium P3-2 were used to degrade macromolecular substances in castor cake by solid-state fermentation. Through the single-factor experiment, taking reducing sugar and free amino acid content as assessment criteria, the optimal culture conditions were obtained as follows: moisture 40%, fermentation time 5 d, strain proportion 1∶1, inoculum 14%, fermentation temperature 30℃, pH 4, bran content 20%. Through the orthogonal experiment, taking free amino a...