It must be acknowledged that the effects of the characteristics and qualities of successful historians in scientific historical research are important and sensitive in every aspect. Because a successful researcher always looks at the phenomena around him with curiosity and truth-seeking plans. Because he has a sensitive, dynamic and searching mind toward what is happening around him. In order to prove historical facts, experienced researchers are constantly trying to identify the authenticity of historical events and phenomena through active methods, especially criticism and analysis, controversy and debate, and make them accessible to the lovers of science and knowledge and human societies.
 In the same way, the significance of the research is as the followings: it identifies the characteristics of the researcher with its positive and negative aspects, such as the good ethics of authorship, honesty, maintaining trustworthiness, having professional and specialized literacy, the authority of impartiality towards writing and the truthful expression of the content. However, regarding the negative aspects of the researcher, issues such as: bias, non-personality, biased expression and illegal betrayals of the researcher have been mentioned. Accordingly, the mentioned issues have added to the importance of this scientific research. In addition, more attention has been paid to its positive aspects and avoid its negative aspects.
 Furthermore, in general the purpose of study is to include the issues of introducing the main features of researchers in the field of history. Particularly, the purpose of this study is to express the positive and negative aspects of the researcher, keeping in mind the requirements of time and maintaining trustworthiness. Last but not least, a library research method was applied to analyze and discuss the materials.