Abstract: Low carbon technique is a general name for different techniques that may reduce carbon dioxide gas discharged in the process of production and livelihood of human being. During the recent one hundred years, with the fast development of economy and increase of people, the use of fossil energy rises rapidly. As a result, on one hand, the fassil energy faces exhaustion; on the other hand, the green house gases, mainly CO₂, increase fastly. This may lead to environmental deterioration, global warming, and natural disasters. Therefore, for the sake of environment protection, energy supplement, and the global warming state diminution, the low carbon technique must be applied, the use of fossil fuel must decrease, new energy must be developed, energy saving and CO₂ gas discharge decrease must be practiced. In this paper reasons for applying low carbon technique, its classification and its applications in main departments of China are presented.