Design of letters or typography is the core of the design of visual communication. In a world full of infinite information and messages, the design of letters is a must-see, which should even be interesting at first before reading it. Poster art information, as part of the information system, has long been one of the concerns of today's culture makers and today's graphic designers. The poster is one of the first components to attract the audience or its motto, among which the letters and the use of it play a major role in creating visual gravity. The purpose of this research is to investigate the textual structure of posters in Iran in recent decades. The results of the research show that in posters designed in Iran, the line was used only for the transfer of concepts and information and as a mere informant, and the less form of its visual forms was considered with respect to the subject. So that the poster's priority was displayed with the image and the photo, then the letters and its place were determined and in terms of the structure of the writing, the posters of the past are more static and more orderly than today's posters. But the posters have become abundantly complex and crowded in handwritten letters or letters, and letters are considered forms and forms of visual.
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