Abstract:There are various definitions on right to know(RK), which make it a respectable, yet, ambiguity concept. In the study in this thesis, starting from the critical assessment of the definition of RK, more than 100 of existing concepts of the RK are analyzed systematically. Based on this analysis, the author found that the difficulty to define the concept of RK could be traced back to the deviation and errors in the logic origin of the definition. Many scholars gave the definitions of RK based on the content and scope of information; some others gave the definitions according to the methods of obtaining information. However, due to the diversity and complexity of the information, and a wide variety of the channels for the acquisition and dissemination of information, the definition of RK is very complicated and varied with large discrepancies. As a result, the RK has become a very broad and complex concept. In this thesis, based on the properties of the rights, the intrinsic meaning and the extension of this right have been redefined.