Antibacterial　peptides　have　been　one　of　the　most　prospects　as　a　new　member　of　antibiotics　in　food　and/or　medicine　industry.　In　this　thesis,　a　novel　antibacterial　peptide,　designated　as　CLP-1,　was　purified　from　Chinese　leek　seeds　by　a　gel　filtration　chromatography　and　reversed-phase　high-performance　liquid　chromatography.　CLP-1　was　composed　of　three　amino　acids,　and　the　sequence　was　identified　as　Ser-Asn-Ala　(SNA)　using　LC-MS/MS,　which　was　a　novel　short　antibacterial　peptide　from　Chinese　leek　seeds.　SNA　showed　moderate　antibacterial　activity　against　the　growth　of　Gram-positive　and　Gram-negative　bacteria,　and　the　minimal　inhibition　concentration　values　of　SNA　against　Escherichia　coli,　Staphylococcus　aureus,　Salmonella,　and　Bacillus　subtilis　were　4.31,　2.24,　4.31,　and　2.24　mM,　respectively.　Moreover,　SNA　exerted　slighter　hemolytic　activity　at　concentration　of　3.44　mM.