Green city is a multi-dimensional concept, which not only refers to the environmental health within the city, but also includes the economic and social sustainability of the city. A green city should be a city that can balance development and environmental protection. Through scientific urban planning and management, the sustainable development of the city can be realized. Cities should have efficient transportation systems, adequate public service facilities, rich cultural and recreational activities and open public spaces, so that people can enjoy high-quality life. Cities should attach importance to environmental protection and resource conservation and adopt sustainable technologies and methods in urban construction and development. Only such a city can truly achieve the goal of sustainable development and become a real green city.