The Constitution of the Islamic Republic of Iran is a written constitution, and adherence to the means of interpretation is necessary for its implementation. In interpreting the constitution, there are two general approaches, source-based and non-source-based, and the Guardian Council, as a competent interpreter of the constitution, has followed the source-based approach according to Article 98 of the Constitution. In the originist approach, the text is of primary importance for understanding the text, and therefore the tools of linguistics can be used. One of these tools is text coherence; It means the structural features of a text or saying that connects different parts of the units of a discourse in a way that creates a system in the discourse, and to measure and create it, several models have been stated, some of which can be used in the interpretation of the constitution. . Since the exploitation of text coherence models in the capacity of constitutional interpretation requires proof of the coherence of the constitutional text; It is necessary to measure the coherence of its text, which itself leads to the discovery of tools and methods for interpreting the text of the constitution. On the other hand, from the results of this assessment, we can find tools that can be used in the legislative process for the coherence of legal texts. Therefore, the present study aims to answer the question, "What is the degree of coherence of the constitutional text?" with descriptive-analytical method. For this purpose, by using three models "Helidi and Hassan theory", "foundation issue analysis model" and "focal theory", he measured the coherence of the text of the constitution and finally proved that the text of the constitution of the Islamic Republic of Iran is relatively coherent.