Persian prose is formed from the thought and style of Iranian writers. In some of the writings, more than one individual thought and style can be seen in their writing."Tansar Letter" is a literary work in the Pahlavi language that Ibn Muqaffa translated it into Arabic and Ibn Esfandiar translated it into Persian as well as added some contents to the letter. This letter shows an example of multiplicity of style in a Persian literary work. The question that can be asked is that; what characteristics can be appeared by the structure of this text, in spite of the writings of the three authors? Tansar's letter has retained its content throughout the letter and also, is the product of the mind and thought of the first author. But in terms of structure, it has a different prose; Some differences have been pointed out in the sources. However, the purpose of this study is to explain multiplicity of style based on evidence. This paper is reviewed in a documentary method. According to the research findings, the individual style of all three authors of the letter is significant in the text; Thus, the writing of the introduction and some ancient words and terms in the letter express the style of the first author; Preface text, Arabic words and verses, and entries made to bring the letter closer to the texts of the Islamic era, And fusion of letters with anecdotes and allegories of the stylistic initiatives of the second author, Updating the written language, elaborating sentences and quoting proverbs and verses are the stylistic features of the third author. The existence of coordination in this triple style has caused the content of the letter to reach its addressee unchanged throughout history.