[Objective] Study on antibacterial activity and stability of the ethanol extracts from Allium mongolicum Regel.(AMR).[Method] Taking AMR as experimental material,from antibacterial and stability test,antibacterial capacity and antibacterial activity substance stability of extracts were studied.[Result] Size order of antibacterial effect of extracts on these 5 strains tends to be:Saccharomyces cerevisiae>Penicillium sp.>Aspergillus niger>Staphylococcus aureus>Escherichia coli;under neutral and slight alkalin...