The present experiment was conducted to study the components in residues of crude fibers (CF), neutral detergent fiber (NDF) and acid detergent fiber (ADF) in feed. The contents of CF, NDF and ADF in rice bran, wheat bran, white clover, citron leaves, whole corn, whole wheat, Vicia villosa, rabbit feed, sorghum, oat straw, alfalfa, rice straw, triticale hay, Pennisetum hydridum, reed, peanut seedling, soybean stalk and rice husk powder were determined via polyester fiber mesh bag method, and determined the content and recovery of hemicellulose, cellulose, acid detergent lignin and acid insoluble ash in CF residue of feed, meanwhile, also determined the content of hemicellulose, cellulose, acid detergent lignin and acid insoluble ash in NDF and NDF residues of feed, to research the composition and the relationship between CF and ADF in CF, NDF and ADF residues. The results showed that the recovery of cellulose in CF residue was the highest (71.28% to 105.03%). There was a highly positive correlation between ADF content (y₁) and CF content (x₁):y₁=1.507 1+1.211 5x₁ (r=0.979 2, RSD=1.863 4, P<0.01). There was a more correlation between the ADF without acid insoluble ash (y₂) content in ADF residue and CF content (x₂) in ADF:y₂=2.406 3+1.077 0x₂ (r=0.990 5, RSD=0.962 4, P<0.01). We propose the accurate calculation method of hemicellulose and cellulose content:hemicellulose content=NDF content (without acid insoluble ash)-ADF content (without acid insoluble ash) and cellulose content=ADF content (without acid insoluble ash)-ADL content.