| This text studied the allelopathy of the Thymus serpyllum L. var.asiaticus. on weeds so as to supply the theory basis of the logical application of allelopathy ,exploitation of weeds-control by biology and new style herbicide. The research result as follows:1 Allelopathy of different harvesting time of organs of Thymus serpyllum L. var.asiaticus. had different effects on test plant. The restraining effect on weeds was best strong harvested at June and July. It indicated exploitation of weeds-control by biology and new style pesticide, harvested at June and July was optimal.2 Allelopathy of different organs of Thymus serpyllum L. var.asiaticus. had different effects on test plant, the order of restraining effect from strong to weak was leaf, stem, root. The result show that different harvesting time has remarkable effect on weeds of leaf, and little influence on weeds of stem and root Restraining effect of leaf on weeds was decline, and little variety of stem and root by different harvesting time, and little differentiate between stem and root.3 Water extract of stem and root of Thymus serpyllum L. var.asiaticus.promoted test plants'growth at low concentration but inhibited them at high, and inhibition became stronger as concentration higher.4 Restraining effect of water extract of organs of Thymus serpyllum L. var.asiaticus. on different test plants was different. Inhibitory rate of water extract of organs of Thymus serpyllum L. var.asiaticus. on seed germination order of restraining effect from strong to weak was Setaria viridis L. Beauv., Chenopodium album L., Amaranthus retroflexus L., Chloris virgata Swartz, and on seeding growth order of restraining effect from strong to weak was Setaria viridis L. Beauv., Amaranthus retroflexus L., Chloris virgata Swartz, Chenopodium album L..5 Primary component of restraining effect of water extract of leaf of Thymus serpyllum L. var.asiaticus. on germination and seeding growth of Setaria viridis L.Beauv. was organic acid next alkaloid.
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