In the grammatical outline of the Middle Persian Manichaean language, its phonetic, morphological and syntactic features are considered and for the first time a detailed description of the differences between the Middle Persian Manichaean and Middle Persian book (Pahlavi) languages ​ ​ is given. The appendix includes transliteratsüo, a transcription, translation and glossary of three Manichaean texts, the language material of which is used especially often as examples.