In order to explore anti-bacterial strains, the study on the inhibit function of the endophytic aetinomycetes and their fermentation liquid on Staphylococcus aureus ,Escherichia coli and rot-knot nematodes is conducted. The results show that S. aureus and E. coli could be inhibited effectively by the body and their fermentation broth of endophytic actinomycetes Y12 and A7 respectively. The inhibition diameters of Yl2 is 15 mm and that of A7 is 21 mm. S. aureus and E. coli can be inhibited by Y7 at the same time. But they couldn't kill or inhib...