The invention belongs to the technical field of medicine, and in particular relates to pyridinemethylsulfinyl imidazopyridine derivatives shown in a general formula (I), pharmaceutically acceptable salts of the same and isomers of the same, wherein R<1>, R<2>, R<3>, X and Y are defined in a specification. The invention also relates to a method for preparing the compounds, a pharmaceutical composition containing the compounds, and application of the compounds to preparation of medicines for treating peptic ulcer.