After the seventh century (AH) when Hadith division into four groups (viz. Sahih, Hasan, Muwathaq, and Daeef) was accepted by The Shiite scholars and faqihs, some of them began evaluating the hadith collections. In spite of accepting the reliability of al-Kafi's hadiths, Allama Majlisi had tried to evaluate the chain of documents of al-Kafi's hadiths, one by one, and often used brief but various expressions in this regard.In addition to statistical presentation of Kafi's hadiths, the author of the present paper tries to classify these various expressions so that the advantages of studying these expressions would be based on the Allama Majlisi's principles, those advantages which can be useful for researchers in the field of hadith, diraya, and rijal.