Objective Based on database mining， the high-frequency compatibility of Caryophylli Fols as the core in formulas for treating diarrhea was analyzed， and the network pharmacology was used to elucidate the mechanism of the core drug group containing Caryophylli Fols in the treatment of diarrhea.Method The online database of traditional Chinese medicine （TCM） was intelligently crawled by Python 3.8.1 programming， and the compatibility rules of Caryophylli Fols were analyzed， and the TCM with support≥0.30， confidence≥0.90 and lift≥1.00 was set as the core drug group of Caryophylli Fols. The components were searched and screened by TCM Systems Pharmacology Database and Analysis Platform （TCMSP）， and the disease targets were collected in Therapeutic Target Datebase （TTD）， GeneCards and DisGeNET database with "Diarrhea" as the key word. The network diagram of "TCM-ingredients-potential targets" was constructed by Cytoscape 3.7.1 software， and the network of protein-protein interaction （PPI） was constructed by STRING 11.0. Gene Ontology （GO） and Kyoto Encyclopedia of Genes and Genomes （KEGG） enrichment analysis of potential targets was analyzed by R language， and the components of the core drug group were preliminarily verified and evaluated by Discovery Studio Client 2016 software.Result A total of 155 formulas containing Caryophylli Fols for treating diarrhea were screened， involving 54 TCMs. The analysis of association rules showed that Caryophylli Fols was strongly associated with Myristicae Semen， Glycyrrhizae Radix et Rhizoma， Aucklandiae Radix and Atractylodis Macrocephalae Rhizoma in the treatment of diarrhea. The core drug group composed of these five TCMs involved 119 kinds of TCM ingredients and 114 potential targets， of which 104 potential targets were distributed in the nervous system， and the key targets were tumor protein p53 （TP53）， transcription factor activator protein-1 （JUN）， mitogen-activated protein kinase 8 （MAPK8）， interleukin-6 （IL-6）， 90 kDa heat shock protein αA1 （HSP90AA1） and so on. GO enrichment analysis mainly involved biological processes such as the regulation of neurotransmitter levels， blood circulation， hormone-mediated signal pathway and regulation of chemical synaptic transmission. IL-17 signal pathway， helper T cell 17 （Th17） cell differentiation， epidermal growth factor receptor and salmonella infection in KEGG pathways were closely related to the treatment of diarrhea. Molecular docking showed that the key target protein had high affinity with quercetin， kaempferol and β-sitosterol.Conclusion The multi-components， multi-targets and multi-pathways involved in the core drug group of Caryophylli Fols are closely related to inflammation and nervous system， so it is speculated that it may treat diarrhea by repairing intestinal shielding integrity and regulating the levels of neurotransmitters.