The contradiction between quality improvement of service (QoS) of Internet application systems and users information privacy is one of the hottest topics in the information system research. It summarizes the research on information privacy psychological boundaries and sensitivity in this field

and includes three main aspects as follows. Firstly

it presents a summary of the definition of privacy in different fields; Secondly

it analyzes the difference between information privacy and similar concepts; Thirdly

it classifies the level of user information privacy from the perspective of information sensitivity.