The International Horticultural Exposition is a main form of exhibiting the garden art.In recent years, with the social & economic development, improvement of people's living standard and urban construction level, big cities across the nation have been actively bidding to host exposition of various types.The purpose of holding horticultural exposition is to exchange achievements on horticultural development and to create more commercial opportunities.Under such background of striking environmental issues, the main issue that must be considered and painstakingly solved by each participant is reducing the energy consumption, using continuously and producing a more positive ecological effect, The paper takes the design of regional garden in International Horticultural Exposition 2011, Xi' an as an example to deeply discuss concepts, methods, and achievements in dissemination of ecological civilization.