This can be seen, although the high-end cutting-edge technology is a means of eco-energy saving building design and construction in Germany, but not the only means. In Germany, both economical and practical but also get a good energy saving effect, this is a very important prerequisite for building energy efficiency. China's current economic conditions, the widespread use of high-tech eco-building construction is unrealistic, but some of the basic features to start using the appropriate technology insulation board features between economic, functional and environment to find a balance, it is entirely feasible. Rules and norms popular German program to promote energy buildings by 2050 the proportion of renewable energy power generation from the current about 20% to 80%, while the primary energy consumption by 50 percent, and has introduced the "Renewable Energy Law" promoting solar, wind, biomass and hydro and other renewable energy development through electricity network subsidies and other means. German building energy saving and environmental protection legislation also walk in the international forefront. In 1976, Germany passed its first energy-saving regulations, "Building Energy Conservation Law"; 1977 insulation board, insulation board Figure Germany began to implement "Building Thermal Protection Ordinance", that Ordinance respectively in 1982, 1994 and 2001 3 times amended. In addition, the German government has successively promulgated the "Regulations of building heating devices" and "Buildings Ordinance heating costs," two related building energy regulations. These policies and regulations to promote eco-energy saving building provides a strong guarantee. China is a big country useful energy consumption, since the late 1980s, the gradual implementation of energy-saving 30%, 50% and 65% of the three-step energy conservation, and the city began to expand in the conditional higher the level of implementation of energy-saving targets Try, for the fourth step is to prepare conditions for the establishment of energy-saving targets. Currently, I am abroad wall insulation technology has entered a stage of development by leaps and bounds, the country's external wall insulation has strict legislation, including the enactment of the Minister to make energy saving, energy law requires mandatory energy efficiency in buildings, facades specification mandatory standard insulation systems, as well as for the system in the constituent materials and other standards-related good insulation boards, the technology and products have sufficient space to play. Regrettably, however, the study of the exterior insulation has been in a state of not deep enough, and even repeated the baseless assertion, in the understanding there has been a big misunderstanding. Moreover, misunderstanding or even written some knowledge on textbooks and lectures across the country, to manufacture a variety of exterior insulation and fog, but also to its development marked the mystical, non normalize imprint. As a staff member for many years engaged in exterior insulation study, I talk about these basic errors in understanding the practical point of view from the project, we hope to be able to cause some thinking people.