Abstract: An actinomycetes strain 18 was isolated from soil of Yunnan Province which can inhibit growth of Colletotrichum capsici. 10 strains were acquired, among which NO. 18 had strongest inhibition activities reached 68.2%. Analysis of 16S rDNA showed the strain was relatsed to Streptomyces flaveus which the similarity reached to 99.9%. Based on the strain was classified to Streptomyces their morphology and physiological and biochemical characteristics, the Streptomyces strain should be nomenclatured as Streptomyces flaveus. The 16s rDNA in GenBank registration number was JX293177.