Abstract: The rapid development of communication technology and the arrival of the era of internet of everything not only aggravate the deployment of communication infrastructure and energy consumption intensively, but also bring potential impacts to network security and electromagnetic environment. Therefore, the discussion of the 6th generation of mobile communications system (6G) network architecture should transfer its focus from network performance and user experience into all-round sustainability of the networks. Based on the traditional networks, an eco-sustainable network architecture for 6G is explored, construction framework from multi-level is discussed, and the dynamic interaction between 6G networks and the real physical world is analyed. Considering the evaluation demands of networks' sustainability, a new comprehensive evaluation system for new network architectures is designed. Aiming at the challenge of multi-dimensional and cross domain sustainability analysis of networks, an evaluation method of communication networks based on machine learning is proposed, so as to provides a reference for the construction and optimization of the ecological sustainability of the networks.

Key words: network architecture design, next generation of communication network, eco-sustainability, evaluation system