There is a relatively popular view that regards technological ethics as professional ethics and responsibility ethics of engineers. Although engineers must follow professional ethics relating to technical work and fulfill the corresponding social responsibilities of engineering technology, technological ethics is not an equivalence of professional ethics or responsibility ethics. Nevertheless, from the genetic point of view, there is historical, realistic and theoretical kinship among technological ethics, professional ethics and responsibility ethics of engineers. Technological ethics has to be related to professional ethics and responsibility ethics of engineers. These three aspects are neither independent nor inclusive. Instead, they overlap or cross one another. What is technological ethics then? The answer is that it should be comprehended the essence of technology in terms of the following aspects: the relationship between man and nature, and inter-human relationship forming during technological activities; the impartible natural and social properties of technology; as well as the exploitation of man’s intrinsic power using technology. Thus technological ethics that fit modern technology can be found and rebuilt within this modern social construction of complex technological system. So, we should establish technological ethics based on the theories of “technology for harmony” and “technology for social construction”. There is a relatively popular view that decision technological ethics as not professional ethics relating to technical work and fulfill the corresponding social responsibilities of engineering technology, technological ethics is not an equivalence of professional ethics or responsibility ethics. Nevertheless, from the genetic point of view, there is historical, realistic and theoretical kinship among technological ethics, professional ethics and responsibility ethics of engineers. These three aspects are neither independent nor inclusive. Instead, they overlap or cross one another. What is technological ethics then? The answer is that it should be comprehended the essence of technology in terms of the following aspects: the relationship between man and nature, and inter-human relationship forming duri ng technological activities; the impartible natural and social properties of technology; as well as the exploitation of man’s intrinsic power using technology. Thus technological ethics that fit modern technology can be found and rebuilt within this modern social construction of complex technological system. So, we should establish technological ethics based on the theories of “technology for harmony ” and “technology for social construction ”.