Several novel trichloromethyl-containing O, O-dimethyl phosphoramidothioate derivatives have been synthesized by the reaction of O, O-dimethyl phosphoramidothioate with chloral imines. The latter were prepared in good yields by refluxing the dichloroethane solution of chloral and substituted anilines using 3 Å molecular sieves as dehydrating agent. Structures of title compounds were confirmed by IR, 1H NMR, 31P NMR, and FT-MS studies.