The article presents an investigation of the questions of the components, structure and genesis of the corpus of base texts (tantras) of the Kālacakra Buddhist teaching. Discovering common text block in the Sekoddeśa and the Śrīkālacakra, as well as discovering redaction of the text, that presented in four verses of the Sekoddeśa, in the Śrīkālacakra, evidence in favor of traditional indications that the Sekoddeśa and the Śrīkālacakra are extracts from the Ādibuddha (according to the tradition of the Kalachakra teaching the root text of this teaching; only fragments that according to this tradition belong to this text are known). Due to discovering this common text block and redaction of named text, a hierarchical two-level system of texts for five of the six complete tantras of the Kālacakra teaching was revealed. Through cross-analysis of the Vimalaprabhā and the Sekoddeśaṭippaṇī revealed that according to information presented in these texts, verses 70–79 of the Sekoddeśa have its origins from the second chapter of the Ādibuddha and the Sekoddeśa contains a set of fragments of several chapters of the Ādibuddha. The research presented in the article makes a contribution to the source study in the field of the Kālacakra teaching both in the aspect of methodology and in the aspects of revealing facts and revealing traditional opinions.