This present paper describes theophylline reacting with chlorodifluoromethane to produce a new compound. The reaction conditions of difluromethylation were improved. After the water, which is easy to lead to by-reactions,was got rid of by adding potassium in the reacting system, the yields were increased from 30% to 86%. The reaction mechanism, reaction conditions and the molecular structure's influence were discussed. The products were charact...