Natural graphite powders were intercalated with copper chloride using gas phase reaction in this study. The effects of intercalation temperature, time, and the amount of intercalants on the structure and the amount of intercalation were investigated. An electron probe x-ray microanalyzer (EPMA) was used to quantitatively measure the copper concentration in copper chloride-graphite intercalation compounds. Only stage 1 and stage 2 structures were found in the present processing conditions and the stage structure is mainly determined by the reaction temperature. Results of EPMA quantitative measurement indicated that the amount of intercalation increased with increasing intercalation temperature. However, the amount of intercalation was independent of the reaction time due to the small particle size of graphite host materials.