Abstract: A process for producing a 4,6-bis(difluoromethoxy)-2-alkylthiopyrimidine, which comprises reacting a 2-alkylthiobarbituric acid and monochlorodifluoromethane in the presence of a base in an inert solvent, wherein, for a first reaction, after charging a part of the base, the rest of the base and the monochlorodifluoromethane are simultaneously introduced to obtain a mixture of a 4-difluoromethoxy-6-hydroxy-2-alkylthiopyrimidine and a 4,6-bis(difluoromethoxy)-2-alkylthiopyrimidine, and then, for a second reaction, to this mixture, the base and the monochlorodifluoromethane are again simultaneously introduced, or the base is charged first and then the monochlorodifluoromethane is introduced.