Like writing on the blackboard. Of course, the "modern educational technology" we often talk about now is actually a multimedia educational means. Such as courseware, projection, network teaching and so on. But if we look deeper and explain it in more detail, it is like this: 1994, the American Association for Educational Communication and Technology (AECT) put forward a new definition of educational technology. "Educational technology is the theory and practice of designing, developing, applying, managing and evaluating learning process and learning resources" 1994 is a prescriptive definition. The research object of educational technology is learning process and learning resources; Its five fields of work are design, development, application, management and evaluation, which also describes the functions of educational technology professionals; The purpose of educational technology is to promote learning. From this definition, we can get many new inspirations: the concept of "teaching" is not mentioned, the learning theory and communication theory are not involved, and the system technology is not specified. In other words, the definition of 1994 cannot explain its theoretical and technical basis. Does this indicate that educational technology is beginning to break away from the media technology, system technology and communication theory on which it depends? The definition of educational technology 1994 is not isolated, but evolved from the previous definition of educational technology. To deeply understand the meaning of the definition of 1994, we must first understand the previous definition of educational technology, and then review the definition of 1994 on this basis. The following are six important definitions in the history of educational technology development: 1. AECT 1963 definition: "Audio-visual communication is a branch of educational theory and practice, which mainly studies the design and use of information that controls the learning process." 2. The definition of American Educational Technology Committee 1970: "(1) From a familiar point of view, educational technology refers to the media produced in the communication revolution, which can be used for teaching purposes like teachers, textbooks and blackboards. Educational technology consists of software and hardware such as television, movies, projectors and computers. (2) Educational technology is a systematic method to design, implement and evaluate the whole learning and teaching process based on the study of human learning and communication according to specific goals, so as to realize effective teaching. " 3. 1970 Definition: "Educational technology is the development (including research, design, production, support, supply and use) and management of development (including organization and personnel) of the components of the teaching system (including information, personnel, materials, equipment, skills and environment). It achieves the goal of solving educational problems in a systematic way. " 4. British 197 1 year definition: "Educational technology is a systematic study of the method to achieve educational goals." 5.AECT 1972 Definition: "Educational technology is a field that promotes human learning through the systematic identification, development, organization and utilization of all learning resources and the management of these processes." 6.AECT 1977 Definition: "Educational technology is a comprehensive organic process of analyzing problems and designing, implementing, evaluating and managing solutions to problems, involving people, procedures, ideas, equipment and organizations, and related to all aspects of human learning." In the above six definitions, these terms appear successively: software, hardware, teaching process, learning process, systematic method, systematization (process) and learning resources. But these nouns do not appear in any definition at the same time, which shows that the meaning of educational technology is gradually expanding in the process of development; On the other hand, it also shows that some concepts have developed into the proper meaning of educational technology (such as media and system technology). ), these are not put forward in the expression, but the meaning still exists. Therefore, although the definition of 1994 only explicitly mentions the learning process and learning resources, it does not explicitly mention the concepts of hardware, software and system again, which shows that the definition of 1994 makes the meaning of educational technology more concise, that is, it makes the unclear meaning in the previous definition (such as learning resources and learning process) more clear, while hiding the clear meaning in the previous definition. || In fact, we should look at the meaning of educational technology from a dialectical and comprehensive point of view. Less, single or "self-centered" will have a negative impact on the development of educational technology. Educational technology is a theory and practice based on its historical development, a form and means of education and teaching, and the essence of spreading human culture based on education and technology. Educational technology is a cause. Based on its influence on people and its potential value, this is the postmodern view of educational technology.