Abstract: To study the effects of fermentation solid of Trichoderma viride strain Tv04-2 on activities of defense enzymes of ginseng through Colorimetry. Results showed that the activities of defense enzymes, such as phenylalanine ammonialyase(PAL), catalase(CAT) and superoxide dismutase(SOD),was measured in leaves.The maximum of peaks of PAL,CAT and SOD activities were enhanced by 44.0%,12.8%,34.0% over contral, Trichoderma viride strain Tv04-2 showed great potential in promoting the disease resistance of ginseng.