Abstract: In order to support the development of the beyond 5G(B5G) and 6G communication industry and system transformation and upgrading, the connotation of the B5G and 6G communication channel digital twin technology is proposed by combining the key links, key scenes, and key objects of the B5G and 6G communication channel simulation. On the above basis, the application model, function framework, technology framework, and standard framework of the digital twin channel are established for B5G and 6G communication. And the application method of communication channel digital twin is discussed in demonstration design, development, and production, test, operation, and maintenance management, which are the traditional life cycle activities of the B5G and 6G communication system. The above research is expected to provide a useful reference for the industrial development and engineering construction of the B5G and 6G system, and promote the application of digital twin technology in the B5G and 6G communication field and industry, and provide technical support for the realization of the B5G and 6G communication channel digitization, intellectualization, servitization, and green sustainability.