The antibacterial properties of sweet gourd water extract and methanol extract were studied. The bac-teriostatic circle diameter、minimum bacteriostatic concentration (MIC) and minimum bactericidal concentration (MBC) of sweet gourd extracts for escherichia coli, saccharomyces cerevisiae and aspergillus niger were mea-sured respectively.And passed the test of the ketchup comparing with potassium sorbate's anti-corrosion effect. The results showed that the two kinds of extracts for three kinds of bacteria had certain inhibition , and the bacte-riostatic effect of methanol extract was better than that of the water extract. The bacteriostatic effect of sweet gourd extract was similar to potassium sorbate for ketchup.%对甜葫芦水提取物和甲醇提取物的抑菌特性进行研究。分别测定甜葫芦提取物对大肠杆菌、啤酒酵母菌和黑曲霉菌的抑菌圈直径、最低抑菌浓度（MIC）和最低杀菌浓度（MBC），并通过番茄酱防腐应用试验与山梨酸钾的防腐效果进行比较。结果表明：2种提取物对3种菌均有一定的抑制作用，甲醇提取物的抑菌效果优于水提取物。甜葫芦提取物和山梨酸钾对番茄酱的抑菌效果相近。
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