Sustainable development is now a popular word in the world. Recently, in an interview with a journalist, professor Ye Wehu expressed his opinion on this issue. He believes that the harmonious relations between human being and the nature and the related concept and mores are the soul of sustainable development. Harmony and equity are the cores of sustainable development. As the symbol of human being's new civilization, sustainable development includes both material and spirit civilization. Only when sustainable development becomes human being's life pattern, life attitude, and habit, can sustainable development be achieved.