Nano-silica（SiO₂）was prepared based on cetyltrimethylammonium bromide（CTAB）， ethyl orthosilicate（TEOS）， NaOH solution，and absolute ethanol as raw materials. Three kinds of coatings（SiO₂/EP，C₆₀/EP，SiO₂/C₆₀/EP）were prepared by ultrasonic dispersing with EP，SiO₂ and C₆₀，and nano SiO₂，and the coatings were characterized by X-ray diffractometer（XRD） and scanning electron microscope（SEM）. The thermal stability andflame retardant performance of the coating were tested by differential scanning calorimeter（DSC）， oxygen index meter，and other instruments. The results showed that the comprehensive performance of SiO₂/C₆₀/EP coating was the best. When the compound ratio of SiO₂，C₆₀，EP，651 polyamide（curing agent）was 25∶6∶300∶150，the comprehensive performance of the coating was the best. Its carbon residue rate，oxygen index value，vertical combustion grade，and hardness were 21. 5%，32. 5%，V-0，and 6H，respectively.