In this paper

fly ash modified by three different coupling included Si-69

titanate and stearic acid was used as filler to reinforce silicone rubber. The structure and morphology of modified and unmodified fly ash were characterized using by Fourier transform infrared spectroscopy and scanning electron microscope. The mechanical and flame retardancy properties of composites were compared. The result showed that the structure of modified fly ash was changed and the surface area was improved observed by FTIR and SEM. The mechanical properties and flame retardancy performance of modified fly ash/silicon rubber composites were greatly improved compared with unmodified fly ash. The best property of silicone rubber composite was added 1wt% fly ash modified by stearic acid.