The Principles of Imāmi School by Muhammad Biābāni Oskuie has been published in two volumes. In the first volume the issues of monotheism, justice, and prophecy are discussed; and in the second one, the issues of Imāmat and resurrection are talked about. In the following paper, the author has criticized this book. Regarding this, he firstly provides a brief list of content of the book; and mentions its benefits. Then, he points out the book weak points. Finally, he presents some suggestions.