1.1 Promote the digestion of nutrients
The addition of 12 flavors including tangerine peel, hawthorn(fried), Shenqu(fried), Qinpi, Baitouweng, etc., and 12 flavors of compound Chinese herbal medicine additives including Fructus, Cangshu, Muxiang, Chenpi, Hawthorn, etc. can increase the fat protein and acidity in feed. The apparent digestibility of the washing fiber, Accelerating the metabolism of sugars in the body and increasing protein and glucose absorption of piglets after weaning 14 D plus 0.4 % Chinese herbal additives(Hawthorn, Angelica, Salvia miltiorrhiza, Astragalus, Astragalus, etc. 11 flavors) can significantly increase 7 days after weaning Jejunum; Fermentation of Chinese herbal residues(composed of Chinese herbs such as alfalfa, Huanglian, cypress, Qinpi, Atractylodes, Baishu, Pomegranate, etc.) can reduce the depth of recesses and the number of E. coli in the ileum of piglets, and increase the length of Villi / recessive depth. The number of lactobacillus and Bifidobacterium; Adding Chinese herbal additives such as Houttuynia, Honeysuckle, Chenpi, Licorice, Banlangen, Astragalus, etc. to the fattening pig diet can increase the apparent digestive rate of nutrients such as dry matter, total energy, crude protein, calcium, and phosphorus.

1.2 Improved body immunity
Adding Chinese herbal additives to the diet can increase the number of white blood cells, red blood cells and lymphocytes in piglets. Increased levels of albumin, globulin, alleles 2(IL-2), IL-4, interferon γ(IFN-γ), immunoglobulin A(IgA), IgG, and complement C3 in serum. The content of IgA, IgG and IgM in the serum of weaning piglets could be significantly increased by the fermented Chinese herbal medicines of Atractylodes arborescens, Cypress arborescens and Albacillus, while the addition of unfermented Chinese herbal medicines had no significant effect on the immunity of piglets. The addition of compound Chinese herbal medicines(Chen Pi, Shen Qu, Shan Zhi, Huangdong, special effects Chinese herbal medicines, molasses, etc.) additives to Du Gou's fattening pig diet can significantly increase the level of serum IgG and tumor necrosis factor α(TNF-α). Significant reduction of IL-6 level. The addition of Chinese herbal additives consisting of Astragalus, Shouwu Vine, Hericium chinensis, Licorice, etc. to the healthy Bamei pig diet can increase the IgG level in the serum of the 30th day of the trial and reduce the level of the test. IgM level in the serum of pigs on the 60th and 90th days.

1.3 Inhibiting pathogenic microorganisms
The alkaloids, flavonoids, acids, volatile oils, and phenols contained in Chinese herbal medicines can change the functions of enzymes and cell membranes in pathogens such as bacteria, inhibit the reproduction of bacteria and fungi, and replicate viruses, and then cause pathogens. Play a direct role in suppressing or killing. The minimum antibacterial concentration(MIC) of Astragalus, Astragalus, Astragalus, Camphora, Codonopsis, Poria, and Baishu 7 kinds of single-taste Chinese medicine were mixed in proportion and cooked in water to produce pathogenic Bacillus Bacillus, Staphylococcus aureus, and Salmonella in pigs. 0.10, 0.05, and 0.10 g/mL, while E. coli has a minimum MIC greater than 0.10 g/mL. Qingdi, pepper, Euonymus and Astragalus extracts have significant inhibitory effects on the proliferation of porcine reproduction and respiratory syndrome virus. Among them, Euonymus extracts have the best effect. Chinese herbal matrine water agent can be used as an external insecticide to kill the parasite pig scabies and pig blood lice. It shows that Chinese herbal extracts can inhibit the growth of bacteria, viruses and parasites, and different kinds of Chinese herbal medicines have different inhibitory effects on different pathogens.

1.4 Anti-stress
Feeding Chinese herbal compound preparation can reduce the content of heat stress protein 70(HSP70) in sows serum. The above results show that Chinese herbal medicine can alleviate the damage of high temperature stress by regulating the body's heat production and heat dissipation, as well as the expression of heat stress protein and hormone secretion. In addition, in the case of cold stress, Rhodiola and Astragalus additives can play an anti-stress role by reducing the content of nitric oxide in pig serum and increasing the GSH-Px activity, red blood cells and white blood cells.

1.5 Porcine diarrhea
Chinese herbal medicines(Huanglian, Huangqin, Baitouweng, Qinpi, Sijiqing, Iron Amaranth, Codonopsis, Chuanxinlian, etc.) Compound injection and clinical use of gentamicin sulfate, norfloxacin, cefthiaphane Suspense, Beryl sulfate and Boilun injection effect on the diarrhea treatment of artificially infected piglets The results show that the therapeutic effect of compound injection is better than that of other injections, and its cure rate is 98 %. The effects of Chinese herbal decoction including pueraria, agaricus, alfalfa, scutellaria, alfalfa, alfalfa, alfalfa, alfalfa, alfalfa, alfalfa, alfalfa, etc. on the treatment of diarrhea in piglets were consistent. Through the research, it was found that Chinese herbal medicine was mainly used to treat Bacillus coliform diarrhea in pigs by inhibiting the propagation of pathogenic bacteria, the diarrhea effect of heat sensitive enterotoxins, the anti-drug diarrhea effect, the reduction of inflammatory exudation, and the inhibition of small intestine advancement.