Third, the first main factor exterior insulation material selection: the low thermal conductivity? EIFS because the threshold is not high technology, on standard setting and policy guidance materials tend to system components and the system itself is isolated and there is hysteresis, the domestic part of the design staff for external thermal insulation technology has not been well understood and mastered, For some practices still exist outside insulation vague concept, often we think the choice of external insulation, low thermal conductivity main material, insulation board diagram, is a good exterior insulation system, lead to the design and construction of touch, insulation board, plus some enterprises misguided, insulation board classification, but also to a wide variety of exterior insulation technology, good and bad. From the perspective of building mechanical and thermal engineering in building exterior insulation and external decoration system, it should be regarded as a composite whole structure to study, and should not be separated into structural layer, insulating layer, crack layer, and Research finish layer separately. Thermal studies show that after installing insulation, due to good thermal insulation properties, resulting in the insulation layer, the outer side showing a different thermal environment, therefore, the construction of composite structures, Weifang insulation board, insulation should be based on the dividing line to engage in various studies. Based on this understanding, we choose the external wall insulation system for basic analysis. It has applied for 26 patents, including 13 invention patents, 13 utility model patents. The patents in the production of carbon dioxide foam technology energy-saving insulation materials, polystyrene recycled plastics have energy saving thermal insulation material. Carbon dioxide foam technology can reduce carbon dioxide in the air, slowing the Earth's greenhouse effect, the full realization of the comprehensive utilization of resources and protection of the global environment. Now, there are four patents pending, the state high-tech companies are also application process.