With the massive application of new technologies such as the Internet，big data and artificial intelligence in administrative management and service activities，the traditional administrative form based on interpersonal interaction have undergone profound changes in models. The new automatic administrative model in form of “Human-Computer” interaction began to appear in large numbers in practice. In considering of the significant advantages of Internet，big data and artificial intelligence in improving administrative efficiency and good governance，the State Council has made a series of regulations aimed at promoting the optimization and upgrading of administrative activities under the conditions of new technologies. Under the guidance of national policies，the practice of administrative automation has already taken place by many local governments. As part of the operation of the state’s administrative power，the implementation of administrative automation is also subject to the principles of administration by law within the framework of the Constitution. Therefore，from the perspective of administrative legitimacy，it is necessary to explain the conformity of the current development trend of administrative automation with the administrative legal system，and to summarize specific legal issues such as subjects，procedures，and form of decisions caused by the implementation of automation.