Migration properties of antidegradants to the surface in filled NR vulcanizates containing both silica and carbon lack were studied using the migtation-generating equipment with a vacuum technique. The migration was carried out at 60, 80, and 100 ℃ for 20 h. BHT, IPPD, HPPD, and wax were used as migrants. IPPD migrates faster than the other migrants. The amounts of BHT, IPPD, and HPPD migrated decrease with an increase of the silica content in NR vulcanizate. Influencing factors of silica and carbon black on the migrations were found to be their porous structure and polar functional groups on the surface. Average activation energies for migration of BHT, IPPD, HPPD, n-C₂₄H₅₀, and n-C₂₅H₅₀ to the surface in the NR vulcanizates are 21.6, 32.7, 39.9, 52.9, and 67.3 kJ/mol, respectively. Migration rates of the migrants in the vulcanizates containing both silica and carbon black are, on th whole, faster than those in the vulcanizates containing 50 phr of silica and are slower than those in the vulcainzates containing only 50 phr of carbon black except IPPD. Migration rates of IPPD in the vulcanizates with the content ratio of 10/40 and 20/30 phr (silia/carbon black) at high temperatures are faster than those in the vulcanizates containing only 50 phr of carbon black.