Triethyl phosphite is an organic compound, the chemical formula is C6H15O3P, colorless transparent liquid, insoluble in water, soluble in ethanol, ether and other organic solvents, will be hydrolyzed into diethyl phosphite for a long time in water. It can be used as an intermediate of medicine and pesticides; Medicine can be used to produce analgesic benthidine, pesticide can be used to produce pesticide insecticide; It can also be used as a plasticizer, stabilizer, additive to lubricants and greases.