Interacting with hadiths, authenticating and weakening of narrators, and describing some hadith terms such as ṣ aḥ ī ḥ , ḥ asan, shā dh, mursal, muwqū f, etc. Hakim Nayshā bū rī differs from others: He verifies some hadiths that are not authentic according to other traditionists, and even according to his own bases in his other books such as ma'rifat ‘ Ulū m al-Hadith. Accordingly, he was accused of being mutasā hil (lenient in hadith). This paper, based on descriptive-analytical method, attempts to firstly reveal his opinions on hadiths of Ṣ aḥ ī ḥ , Ḥ asan, Ḍ a'ī f, Mawqū f, Mursal, Shā dh, Zī yā dā t al-Thiqah, citing from a heretic narrator, report of sanad and text of narrations, Jarḥ and Ta'dī l. Secondly, it compares Hakim’ s views and method to other traditionists. Thirdly, it shows how much Hakim, in his al-Mustadrak, adhered to his bases. It is intended to reveal his bases and views, as well as his own adherence to them. As such, the basic features of Hakim’ s hadith school would be detected. Based on the reviews and comparisons, it can be said that it is not acceptable to ascribe tasā hul to Hakim’ s method in verifying hadiths of Mustadrak, justified by some evidences including his old age, memory weakness, lack of time to edit his book. Also, it is notable that to use his hadiths in Mustadrak, one must review both sanad and text.