Abstract: Abstract: Ternary FeCl3-NiCl2-GICs were synthesized by the molten salt method, with natural graphite flake used as host and a mixture of NiCl2 and FeCl3 as guest. The effect of molar ratio of carbon to metal chlorides, molar ratio of NiCl2 to FeCl3, reaction temperature and reaction time on the stage structure and the Ni/Fe molar ratio of the products, as well as the intercalation reaction process of NiCl2 and FeCl3 between graphite layers were studied. The results show that ternary FeCl3-NiCl2-GICs with different stage structure and molar ratio of Ni to Fe could be obtained through changing the molar ratio of carbon to metal chlorides, molar ratio of NiCl2 to FeCl3, reaction temperature and reaction time. The molar ratio of Ni to Fe of the products increased with increasing molar ratio of NiCl2 to FeCl3 and intercalation reaction temperature. When the molar ratio of carbon to metal chlorides is 3:1 and the molar ratio of NiCl2 to FeCl3 is 3:7, stage one FeCl3-NiCl2-GIC was obtained at 400℃ in three days. The intercalation reaction mechanism may be considered as FeCl3 being gradually replaced by NiCl2.