The research deals with a term mentioned by a group of scholars of sahih Imam Bukhari, and this term is: the methodology of Imam Bukhari in his sahih book. The objectives of this research is to specify the definition of the term lexically and contextually, to highlight some of the features of the precise approach that Imam Bukhari followed in his book, to reveal the intensity of the attention of Hadiths scholars when explaining the book of Bukhari and to highlight a number of applied examples of the methodology that the bukhari used in his Sahih which have not been exposed to previous studies. The methodology of this research: is the inductive analytical approach. The main findings of this research: to proof that the Imam Bukhari had a precise scientific methodology that he followed in his classification, to show that this accuracy and precision of Bukharis book is parallel to the long period he spent in writing his book, and to clarify some of his habits that he used to consider when titling each chapter in the book. One of the most important recommendations is to write extensive studies that combine the methodology of Imam Bukhari, and to build academic scientific projects that extract the details of sahih and the hidden procedure in selecting the authentic hadiths.