Textile moisture permeability refers to the performance of sweat through the fabric, also known as permeable steam, is reflected in the body when the heat to maintain the body heat and heat dissipation of one of the indicators of heat balance. Moisture permeability: (G / m2.h) or grams per square meter of 24 hours (g / m2.h) per gram per square meter of water vapor per unit area of the sample in the specified time under the condition of maintaining the specified temperature and humidity conditions on both sides of the sample, M2.24h). Moisture: (G / m2.Pa.h) per square meter per square meter of water vapor per unit area of the sample, which is vertically passed through the unit water vapor pressure under the condition of the specified temperature and humidity conditions. The GB, European standard, American standard, the Japanese standard has a moisture permeability test standards, these standards are tested moisture permeability index. From the method point