Preposing and postposing are one of the most important inter-artistic concepts that has a cohesive, order-creating and imaginative presence in the structure of various artistic creations. In literature, the term "preposing" and "postposing" and its order-building and aesthetic functions are known to literary activists, and from the distant past, scholars such as Abdul Qahir Jarjani have discussed it in separate chapters. But in calligraphy, despite its wide use and great importance, like other calligraphic rhetorical techniques, it remains nameless and has not been mentioned in treatises. The present research in a descriptive-analytical way, for the first time by uncovering the existence of two devices "eloquence" and "rhetoric" in calligraphy and its role in creating the primary and secondary order of structures, and the movement of components from sequential positions to preferred positions based on "contractual" and "contextual" implications, It has explained the inter-structural interactions in two textual systems of script and language and revealed the most hidden structural links of literature and calligraphy in the vast realm of preposing and postposing. Based on the results of this research, script and language both have an adaptable nature and their components provide the possibility of restoration, regeneration and renewability in an endogenous and dynamic system during calligraphic and literary creations. These possibilities have entered the structure of calligraphy and literary works through processes such as preposing and postposing, and they give them the ability to be organized in two devices, eloquence and rhetoric.