Azelnidipine is a dihydropyridine calcium channel blocker, is widely applied thanks to a reliable pressure reduction effect and has the characteristics of long acting duration and moderation in acting. As for preparation of an azelnidipine composition, reduction of contents of main drugs of the composition and rise of related substances can be caused by inappropriate compatibility. According to the technical scheme, a stable tablet containing azelnidipine and ethyl cellulose, provided by the invention, is characterized by being obtained by coating azelnidipine with an ethyl cellulose ethanol solution at a certain concentration and then carrying out granulation and tabletting.