System idea is the basic working approach of the Chinese Communists. As an important idea of building a life community of man and nature， Chinese communists''conception of the system idea in the new era benefits from the theoretical guidance of Marxist dialectics； it is inseparable from the enlightenment and nourishment of an overall idea from traditional Chinese culture； and it is formed in the evolution logic of the Communist Party of China in regulating the relationship between man and nature with system thinking over the past century. To build a community of human and nature under the system idea， we should have a correct way of thinking， adhering to the unity of increasing the green nature and reducing pollution， the unity of major breakthroughs and overall promotion， the unity of systematic planning and long-term achievement， and the unity of multiple players and many approaches. We should apply the systematic and dialectical way of thinking to the practice of building a human and nature community under the guidance of "six adherences"， and muster a powerful force to promote the harmonious coexistence between man and nature.