The concept of educational technology illustrates what is intangible intelligent technology in educational technology. Please talk about your understanding and application of them in practical teaching. In order to promote the healthy development of educational technology theory and practice, how to build an educational technology theory and practice system with China characteristics and in line with the world has become a key issue in the development of educational technology in China. The author of Theory and Practice of Educational Technology (published by Hebei University Press), on the basis of comprehensive analysis of the development and understanding of educational technology in the world, discusses the essence of educational technology, puts forward the concept of educational technology, and makes a beneficial attempt to build a theoretical and practical system of educational technology with China characteristics by combining the practice of educational technology in China. Inheritance is the foundation of development. Inheritance does not mean conservatism, but for better development. This book makes an in-depth study of the development history of educational technology in China and inherits the excellent theoretical research results in the development of educational technology in China. At the same time, according to the development trend of educational technology in the future, the theoretical research results in history have been innovated and the original theory has been developed. For example, according to the viewpoint that "technology includes tangible material technology and intangible intelligent technology", "media education technology" formed in the development of educational technology in China is classified as tangible material education technology, while "teaching system design" developed recently is classified as intangible intelligent technology. The internationalization of education is the characteristic of the development of modern education. Developing nationalized educational technology with China characteristics does not mean that we should rest on our laurels. In order to keep up with the development of educational technology in developed countries, we must introduce and absorb foreign advanced educational technology theories and methods. Only in this way can China's educational technology go to the world and blend in with the development of the world. Through the comparative study of educational technology, this book points out the conceptual and theoretical differences between China's educational technology and foreign educational technology. While maintaining the nationality of educational technology, it creatively introduces the foreign viewpoints of educational technology into China's educational technology theoretical system, so that China's educational technology theoretical system not only maintains its own nationality, but also embodies its internationality.

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