With the rapid development of Internet technology and modern communication technology, a large number of new media have emerged, which began to break the situation of traditional media dominating the world, and have a great impact on the mainstream media status of radio and television. In the new situation, China's radio and television media how to maintain their dominant position in the fierce competition and enhance their external communication power in international communication is an important issue facing modern radio and television. Taking this as the research background, this book carries out research on radio and television transmission technology and service. on the one hand, it makes an in-depth analysis of China's terrestrial digital television broadcasting frequency planning, radio and television monitoring system design, and summarizes the development path of radio and television transmission technology. On the other hand, it studies the public cultural service of radio and television in the new media era, the construction of public service of radio and television in rural areas, and the public service of television under the background of digital countryside. this paper puts forward the basic needs of society and people for communication and television services under the current background, so as to create space for the transformation and development of modern radio and television.