Educational technology is a new discipline. In fact, there has been some discussion about what its research object is. After reading this chapter, I have a little understanding of this problem. The research object of educational technology is educational technology. The problem of educational technology is the intersection of educational problems and technical problems, which mainly includes three kinds of problems, namely, technical problems in the field of education, educational problems closely related to technology and the relationship between education and technology. The so-called technology in the field of education refers to all means, ways and methods that are functionally helpful to promote people's learning and improve people's performance and conform to the purpose of education. For example, the design and development of media and technology, the implementation, execution, promotion and evaluation of a certain technology in the process of education and teaching, how to improve the design and development process, how to improve the quality of design and development, how to improve, optimize and evaluate technical schemes, products and systems, etc. Education problems closely related to technology are more about facts and values, such as information technology education, teaching objectives under the new technology environment, teaching and learning process, teaching mode, curriculum problems, education and teaching evaluation, etc. But the problem of vocational and technical education does not belong to educational technology. People are full of expectation that TV, computer and network can improve the teaching environment and improve the teaching effect. People are eager for new media and new technology, but why does education need technology? What can science and technology bring to education? The relationship between technology and education has become the basic and core issue of educational technology.