Green development idea of China is a promotion of Marxism ecological thought and an effective prescription made by China in combating the global concern of eco-crisis. Green development idea is in nature both a theory and a practice,carrying the practical rationality connotation of Marxism in manifestation of equality,perfection,validity and integrality. These characteristics allow the idea to become practicable and breed a leap from the one-dimensional "black development" to "green development" in the course of human's practice involving themselves and the nature. Green practice,an external result of green development,demonstrates the practical significance of the green development idea:rationality,ethical concern and win-win benefits. Accordingly,an exploration of theoretical construction and practice significance of green development will provide solutions to eco-crisis and capitalist's quandary,as well as provide alternatives of shared values to extreme individualism.