Humic acid is a kind of macromolecular compound with complex composition. According to its solubility in different solvents, it is divided into three components namely fulvic acid, brown humic acid and humic acid. Humic acid is widely found in nature in lignite, weathered coal, and peat. The content of humic acid ranges from 30% to 70%. In the 1970s, there was an upsurge in the research and application of humic acids, mainly to solve the shortage of fertilizers for agricultural production at the time. . The biological activity and special structural properties of humic acid play a peculiar role in plant growth. The organic acid species provided by humic acid in natural coal is called MFA, and the humic acid-like substance produced by our first biochemical method is called BFA (Biotechnolosy Fulvic scicl). This environmentally friendly green technology provides a larger platform for the application and development of humic acid products. At present, humic acid substances have been used in agriculture, forestry, medical and health, petroleum, building materials, environmental protection, pesticides, fertilizers and other industries. In particular, the strengthening of people’s environmental awareness and the prevalence of green health foods, then to solve this problem and provide these edible substances, humic acid will play an important and unique role. Therefore, humic acid will have a broader market space. It will also promote the faster development of this product and industry. The biological activity of humic acid The main elements of humic acid are carbon, hydrogen, oxygen, nitrogen and sulfur. It is a polycondensation of polyvalent phenolic aromatic compounds and nitrogen compounds. The molecular weight distribution is wide, the molecular weight of small molecules is tens of thousands, and the molecular weight of macromolecules ranges from tens of thousands to several million. The structural composition is also quite complex and contains various functional groups such as phenolic hydroxyl groups, hydroxyl groups, alcoholic hydroxyl groups, hydrazine hydroxyl groups, enol groups, sulfonic acid groups, amine groups, free sulfhydryl groups, semiquinone groups, decyloxy groups, and methoxy groups. . The various components are entangled with chemical and physical effects such as bonding, hydrogen bonding, and adsorption. Due to the existence of these active groups, the acidity, hydrophilicity, ion exchangeability, complexation, high adsorption capacity, buffering, and catalytic ability of humic acid are determined. Adding humic acid to the feed can effectively absorb various poisonous and harmful substances produced by the feed due to storage, and can also absorb toxic substances produced by digestion and metabolism during digestion and metabolism. Such as: amines, hydrogen sulfide and other substances, maintain the normal microflora of the intestine. Humic acid is added to the feed and can also act as a drug, which has a significant therapeutic effect on intestinal ulcers and gastritis. Because humic acid contains small molecules of fulvic acid, it can adhere to the surface of ulcers and play a role in prompt hemostasis, which is beneficial to the rapid healing of tissues. Humic acid has an immune-enhancing effect on animals. In the course of immunization, antigen-substance uptake, cellular immunity, and humoral immunity all have a promoting effect. Humic acid contains sulfhydryl groups that can participate in the body's redox reaction, maintain a vigorous metabolism, and promote cell proliferation. Humic acid can also act on the autonomic nervous system, inhibit sympathetic nerve activity, make animals quiet, and reduce consumption. Because humic acid is an organic acid, it can regulate the pH value of the digestive tract, promote the secretion of digestive enzymes in young animals, activate the activity of various enzymes in the body, change the permeability of the cell membrane, increase the absorption of feed nutrients, and increase the feed. The utilization rate promotes growth and development. For biochemical fulvic acid, it not only contains humic acid, but also contains a certain amount of nucleic acids, amino acids, VB, VC, inositol, and polysaccharides. In addition to its strong biological activity, it is also an important nutrient for animals. In short, according to clinical evidence, humic acid has hemostatic, anti-inflammatory, analgesic, astringent, absorption, anti-allergic, promote secretion, regulate gastrointestinal function, improve immunity, and enhance animal resistance to disease. At present, some feed manufacturers, in order to cater for the consumption psychology of farmers, improve the growth of animals, pursue the effects of feed, and add a large amount of antibiotics to feeds. Because of the residues of antibiotics, they directly affect people's health. Humic acid, as a green product, can be added to the feed to replace antibiotics. In recent years, scientific research shows that humic acid, as a new type of feed additive, has unique effects and plays a very important role in aquaculture, and it will certainly promote the development of the feed industry. The prospects for the development of humic acid Humic acid is used in aquaculture and is rarely reported in China at present. As a natural active substance, it can replace antibiotics in a certain range and be used as a disease prevention agent. The development of humic acid has a broad market prospect. Problems in the humic acid industry: If the production scale is small, the technology is relatively backward, the quality is unstable, the technical strength of each enterprise is weak, and the development and application research are not enough, thus restricting the development of this industry. The strange effect of humic acid, its mechanism is still not well understood, and needs further study in order to increase the wider application space and application value of humic acid.