Contrastive Linguistics maintains that students of foreign languages make certain systematic errors in the process of learning that are the result of the interference of structures and patterns of their mother tongue. Comparing and contrasting languages, therefore, will help language teachers and those developing teaching materials to draw the student’s attention to differences
between the two languages and make them aware of the errors they make unconsciously in the process of learning. Moreover, using data gathered through contrasting languages or their subsystems, foreign language teachers will be able to put emphasis on those linguistic features which are different in the two languages. This study aims at contrasting suprasegmental features of Persian and Japanese languages.