关 键 词 ：教育技术；功能；评价；媒体；可拓学；课程教学学科分类：教育学--教育技术学
Educational technology is multifunctional. Giving full play to the multifunctional role of educational technology is a great significance to promote the development and progress of education. Based on the principles of comprehensiveness, scientificity, systematicness, accessibility and comparability, relevant experts in the field of education are invited to use the DEMATEL method to select and construct the index system of multi-functional evaluation of educational technology from the three dimensions of educational technology on the allocation of learning resources, the construction of learning environment and the management of teaching activities. At the same time, the extension logic evaluation method based on subjective and objective comprehensive weighting is used, This paper makes a multi-functional evaluation of educational technology centered on language, books, projection and slide show, recording and broadcasting, film, television, computer, network and other media. The result shows that language is the foundation of modern educational technology. If artificial intelligence technology wants to play a greater role in the field of education in the future, it must first solve the problem of artificial intelligence simulating the communication of spiritual elements such as human "language", otherwise it is difficult to achieve people's expected goal.