Abstract: A 55% propisochlor-atrazine-2, 4-D butylate suspoemulson, the commonly used herbicide for corn crops, was diluted with water into solutions with herbicide concentrations of 0.55%, 0.27%and 0.18%and sprayed on 10 medicinal plants including Polygonatum odoratum (Mill.) Druce var., Oreorchis patens (Lindl.) Lindl., Mukdenia rossii (Oliv.) Koidz., Clematis chinensis Osbeck, Acanthopanax senticosus, Lysimachia christinac Hance, Liliumdauricum, Schisandra chinensis (Turcz.) Baill.Syringa reticulate., Dioscorea nipponica Makino.Possible phytotoxicity on the plants were examined.It appeared that P.odoratum and O.patens were not significantly affected by the sprays, and therefore, could be safely co-planted with the corns on the fields treated with the herbicide for weed control.