Ivermectin is a new kind of broad-spectrum, highly effective and low-toxicity antibiotic, which has a good antiparasitic effect on both inside and outside parasites, especially nematodes and arthropods.But not to tapeworm, trematode and protozoa.Large ring lactone class parasite drug resistance to nematodes and the function of flooding killed by arthropods, is to increase the insect body inhibitory neurotransmitter gamma aminobutyric acid (GABA) release, and open the glutamic acid control Cl ion channels, strengthen the nerve membrane permeability of Cl, thereby blocking nerve signal transmission, nerve palsy, eventually lose muscle contraction ability, and killing insect body.