Methyl 2-(4-((3-chloro-5-(trifluoromethyl)-2-pyridinyl)oxy)phenoxy)propanoate is a selective herbicide, an inhibitor of fatty acid synthesis, and has a systemic effect. After the stem and leaves are treated, it is quickly absorbed by weeds and transmitted to the whole plant, hydrolyzed into acid, and inhibits the growth of root and stem meristems, resulting in death. For soybean, cotton, peanut, rape, nursery, flax, and other broad-leaved crops to control crabgrass, kangaroo, beef tendon grass, barnyard grass, foxtail, chinensis and other annual grass weeds and bermudagrass, imperatae, etc. ineffective against broadleaf grasses and sedges.