The molt grafting reaction was employed to graft vinyl trimethoxysilane（VTMS）to polyethylene-wax（PEW），and the characteristic absorbance peaks at 1090 cm-1，1030 cm-1 and 960 cm-1 in FTIR spectra proved the successful grafting. As a precursor，tetraethoxysilane（TEOS）was mixed with grafted PEW and then a PEW/SiO2 hybrid material could be prepared by the sol-gel process. The morphology and properties of the hybrid were studied with FTIR，TEM and TG/DTA. The study indicates that the hybrid containing 0. 98%—4. 12% of SiO2 could be prepared via the sol-gel process and good compatibility of the molecules of grafted PEW and SiO2 particles was observed. The study also showed that the thermostability of PEW was improved at the presence of nano-SiO2 particles. The decomposing temperature of PEW was increased by 21. 34℃ when 3. 75% of SiO2 was present.