Abstract:A carboxyl-modified polyether silicone(CAPES) was prepared by using epoxy terminated siliconeoil(α,ω-ESO),amine terminated polyether and maleic anhydride(MAn) as raw materials.The self-made carboxyl polyether silicone(CAPES) was emulsified as a white translucent blue emulsion with the nonionic surfactant isomeric alcohol ethoxylates,and the emulsion used for raw silk soft finishing．The chemical struc-ture of CAPES,its emulsion and membrane configuration on silk fiber surface were characterized by means of infrared spectroscopy(IR),nanoparticle size analyzer,Zeta potential analyzer and scanning electron microscopy(SEM).The effects of CAPES Solution pH,immersion time and silicone emulsion dosage on its treatment performance toward silk fiber was also discussed,The results showed that the average particle size of the CAPES emulsion was 84.6nm,its potential was -21.5mV,and it had a good filmforming ability on silk fabric surface. The treated silk achieved satisfactory effects when CAPES Solution pH is 6,immersion time is 30min and the dosage of CAPES is about 5g/L.