Abstract: Abstract: As a new computer application technology, persuasive technology is widely used in many fields. In the current study, persuasive technology is regarded as the concrete manifestation of the phenomenon of technology mediation in the mediation theory of philosophy of technology, thus the reason why the persuasion result is uncertain can be explained. In the ethical field，in order to deal with the question that persuasive technology may lead to manipulation and paternalism, the framework of inner moral evaluation in the design of persuasive technology is constructed and revised，and the respect for the individual voluntariness is regarded as the starting point of persuasion ethics. In addition, the characteristics of persuasion rationality, the trust in persuasion technology and whether persuasion technology restricts human freedom are discussed.