Effects of berberine on diseases by regulating intestinal flora. 1. Berberine can activate TLR4/MyD88/NF-κB signal pathway to play an anti-inflammatory role, and increase the populations of Bacteroidetes, Clostridia, Lactobacillales, Prevotellaceae, Alloprevotella, Butyricimonas, Coprococcus, Ruminococcus, Lactobacillus, Akkermansia, Verrucomicrobia, reduce the populations of Bacteroidales, Lachnospiraceae, Rikenellaceae, Desulfovibrio, Streptococcaceae, Clostridiaceae, Prevotella, Proteus, Saccharibacteria, Deferribacteres, Actinobacteria, which affect the development of diabetes. 2. Berberine affects liver diseases by regulating FXR and NF-κB signaling pathways through intestinal flora. 3. Berberine down-regulate F:B (Firmicutes : Bacteroidetes) and up-regulate SCFA-producing bacteria Allobaculum, Bacteroides, Blautia, Butyricicoccus, Phascolarctobacterium, A. muciniphila and GLP-1R in obesity. 4. Berberine regulates hyperlipidemia by reducing Prevotella, Escherichia, Clostridium Sutterella and increase Bacteroides, Parabacteroides, Blautia, Enterobacter, Akkermansia, Escherichia-Shigella, Incertae sedis, Lachnospiraceae FCS020, Clostridium sensu stricto 1. 5. In Enteropatia, berberine enriched the relative abundance of Firmicutes and decreased Proteobacteria at the phylum level. Meanwhile, berberine increased the propotion of unclassified_f_Porphyromonadaceae, unclassified_f_Lachnospiraceae, Lactobacillus, unclassified_o_Clostridiales, Ruminococcus, Prevotella, Clostridium IV, and decreased Escherichia/Shigella at the genera level. 6. Berberine affect the development of Atherosclerosis by changing the amount of Verrucomicrobia, Akkermansia in Apoe (−/−) mice fed a high-fat diet in the intestine.