Building eco-cities is one of the ways to realize an eco-civilization. and it is also a wise choice for humanity to explore one way to coexist with nature in harmony. It means to build a composite ecosystem where nature, society and economy interdepend to achieve sustainability of environmental friendliness, social equity and economic growth. The concept of eco-cities illustrates the importance of eco-cnvironment in improving people’s livelihoods and fostering coexistence between man and nature. It also serves as a positive response to people’s increasing demand for the beautiful eco-environment.