The presence of MoOCl3 with MoCl5 was found to change the stage structure of resultant graphite intercalation compounds (GICs) with MoCl5. Heating MoOCl3 with MoCl5 and graphite at 200 degrees C for seven days produced stage-1 MoCl5-GIC in a single phase, though no addition of MoOCl3 resulted in the formation of poorly crystallized stage-3 GIC and a large amount of its addition in no intercalation of MoCl5.