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<i>Ceratocystis fimbriata</i>, which produces volatile organic compounds (VOCs) during the cultivation on medium, is a widely distributed fungus in field soil and seriously causes kinds of plant diseases. The bioassay of <i>C. fimbriata</i> on the growth of soil-borne fungi and germination of crop seed is a key point for verifying the multi-action of this VOCs-fungus in soil ecosystem. Ten components of the compounds have been identified by headspace GC-MS method. The effect of the VOCs on the growing of soil-borne <i>Rhizoctonia solani</i> and rice seed germination was investigated. By means of vertical dual test in vitro without physical contact or diffusion through the culture medium, it indicated that mycelium growth of <i>R. solani</i> was strongly inhibited by VOCs generated from <i>C. fimbriata</i>, with the inhibitory rate of 82 %. The fumigated mycelium appeared thin, malformed, and even lost the ability of sclerotinia formation. The inoculated <i>R. solani</i> on rice seeds was completely controlled seven days after fumigation by six-day-cultured <i>C. fimbriata</i>. Remarkably, germination of rice seeds was also influenced by VOCs generated from <i>C. fimbriata.</i> These preliminary results pointed out clearly that VOCs<i>-C. fimbirata</i> possess both inhibition on soil-borne <i>R. solani</i> and rice seed germination.<p><p>Keywords: Fungus, Cereals-Grains, Rice