This study focuses on the knowledge of inter-relations between surah al-isra’ and surah al-kahfi and aims to derive patterns of thematic relation between them and discloses its hypothesis by responding to two main questions: the first, whether they have limited and strong relationship. The second, what are types of relationship between the two surahs in terms of the topics, contents, and meanings. As for the method followed for this study is descriptive and resolving the issues by referring to the main references.The outcome of the study appears in two main points.Relationship between the two surahs very strong in terms of the objectives and aims, strong connection between beginning and ending of the both surahs, as well as between the ending of the al-isra’ and the beginning of the surat al-kahf. It appears that thematic harmonization in both surah, particularly regarding the issues; of the faith, prophethood, truthfulness of the message and the high ranking of the status of the Prophet.