Amino silicone resins were synthesized through a three-step method using(3-aminopropyl) triethoxysilane(APTES), methyltrimethoxysilane(MTMS) and end-capping agents, The products were characterized by Fourier transformed infrared spectroscopy(FT-IR), nuclear magnetic resonance(1H NMR), element analysis and gel permeation chromatography(GPC). The results of 1H NMR indicate that the chemical shift signal of acid-catalyzed products is weak at δ3.4(attributing to alkoxy). FT-IR shows that there is a vibration peak of Si—OH at 3 100-3 600 cm-1 and the intensity of the peaks is most weak at 6h. The results show that this method cannot only effectively reduce the residue of alkoxy groups and Si—OH groups, but also obtain the products with sufficient amino group. It concludes that this resin is suitable as modifier in the silicone rubber. Amino silicone resins were synthesized through a three-step method using (3-aminopropyl) triethoxysilane (APTES), methyltrimethoxysilane (MTMS) and end- capping agents, The products were characterized by Fourier transformed infrared spectroscopy (FT- (1H NMR), elemental analysis and gel permeation chromatography (GPC). The results of 1H NMR indicate that the chemical shift signal of acid-catalyzed products is weak at δ3.4 (attributing to alkoxy). FT-IR shows that there is The results show that this method can not only only reduce the residue of alkoxy groups and Si-OH groups, but also concludes that this resin is suitable as modifier in the silicone rubber.