Amir Kabir is one of the influential rulers of the Qajar government apparatus, who made important corrective actions to promote the affairs of the country. His remaining documents, which are of great importance, were his letters to Nasser-al-Din Shah, indicating their kind of dialogue. Imam Khomeini is one of the biggest characters of the islamic republic, whose idea, words and other personality characteristics, have given a different color to his works. In terms of the categories of prose types, they political letters are a kind of prose, and the authors has used folk script to express his purpose. The most important syntactic features of these letters are: letters, language and spoken expressions, and they use slang writing. Linguistic command and structure The sentences are more spoken. The collection of these characteristics, has made his method of political letter writing more distinguished than the others. Long sentences, depending on the situation, are more frequent then the short ones. Arabic benedictory sentences have taken a small part of the grammer. The distinct part of Imam's political letters, is his avoidance of linguistic complexity. Conversational and speaking way of writing the sentences, is one of the most important factors of his syntactic feature. Sentences are similar in speech. He gathers the mass of people in syntactic manner. Study in seminary and having the role of authority also causes the conversational tone of Imam. He also uses arabic sentences as exemplification and confession. Statements are simple, clear and straight, but duo to the usage of arabic words and other religous terms reader may have some pauses. The main principle in his writings is simplicity and ignorance in difficulties.