ETICS, the abbreviation for External Thermal Insulation Composite System, is the most important measure to improve the thermal insulation of building envelope. The ETICS technology places the insulation layer on the outer surface of building envelope, so that heat preservation and thermal insulation of building can be both guaranteed, while also playing a protective role in buildings, protecting buildings by avoiding direct exposure to the atmospheric environment, against a great variety of corrosion and damage in the atmospheric environment. Therefore, the application and development of ETICS technology has attracted more and more attention. Its requirements on the plastering mortar are as follows: (1) Requirements on system integrity, durability and availability The ETICS project should adapt to the normal deformation of base coat without cracking or hollowing, support the weight of structure itself for long without harmful deformation, withstand the effects of wind load without damage, resist the long-term repeated effects of outdoor climate without damage, and should not fall off from the base coat in the event of rare earthquakes. (2) Requirements on the fireproofing property The fireproofing property of ETICS project should comply with the relevant national regulations, and for high-rise buildings, the ETICS project should take fire protection construction measures. (3) Requirements on the waterproofing property ETICS should have resistance to water penetration, preventing the penetration of rainwater and surface water. Rainwater cannot penetrate through the protective layer, or penetrate into any part possible to cause damage to external thermal insulation composite wall. (4) Requirements on the physical and chemical stability All components of ETICS project should have physical and chemical stability. All constitute materials should be compatible with each other and have resistance to corrosion. In the event of possible biological invasion (by rats or insects), ETICS projects should also have the performance of preventing biological invasion. 5) Requirements on other properties of ETICS Its resistance to wind load, shock and to frost should comply with the requirements of relevant national standards.