This article is devoted to the examination of the communicative structure of simple narrative sentences and means of expressing it in the Persian language. The study of this subject remains important because it is conducive to a better and deeper understanding of the meaning of the Persian sentence by the addressee of the speech. The scientific novelty lies in the fact that until now there has not been a scientific study of the communicative structure of the Persian sentence, which serves as a source for the use of native Russian speakers in teaching the Persian language. In this work, we pay attention to the aspect of meaning or purpose of the Persian sentence and determine the rules of Persian grammar at this level of the sentence. This study shows that the communicative structure of the sentence in Persian language has a certain stable organization: the initial information of the utterance always is expressed at the beginning of the sentence and actual information occupies the final position in the sentence, in other words, the theme precedes the rheme. Moreover, in this language, any member of a sentence cannot be the theme and rheme of the utterance, and only certain members can perform such functions in a sentence. And the main means of changing the communicative structure of a Persian sentence is the order of arrangement of the main members in the sentence.