Abstract: Silk fiber was treated with D4([(CH-3)-2SiO]-4) low-temperature plasma,and the variations in moisturizing capacity,anti-crease property,surface roughness and drapability of the treated silk fabric were examined.Testing methods such as SEM,EDS,and FTIR-ATR were used to study the effect of plasma treatment on the silk fiber microstructure and properties of the fabric.In addition,the mechanism of modification was also investigated.From the results it is showed that D4 plasma treatment can improve the inter-woven resistance,wrinkle resistance and softness of the treated silk fabric and impart it good water repellency property.