In order to make better use of exfoliated graphite in electro-optical countermeasure, the micro-morphology and expanding volume of preformed precursors and the infrared extinction of exfoliated graphite exfoliated from the precursors were researched, respectively.First, the micro-morphology of precursors preformed at different pressure were analyzed by scanning electron microscope, and the morphology of exfoliated graphite from preformed precursors were observed by a stereomicroscope; Then, the expanding volume of the preformed precursors were tested; Finally, the infrared extinction of exfoliated graphite exfoliated from the preformed precursors was measured and analyzed.Experimental results indicate that the scales and layer of the preformed precursors is bended, distorted and fragmented, the opened interlayer spacing becomes shorter, and its intercalated structure is destroyed.As the preforming pressure is increasing, the expanding volume of the preformed precursors decreases from 356 mL/g to 216 mL/g, while correspondingly the infrared screening rate of exfoliated graphite obtained from above precursors decreases from 0.87 to 0.42.Therefore, the micro-morphology of the preformed precursors is destroyed seriously due to performing pressure, and its expanding volume and infrared-extinction of exfoliated graphite exfoliating from the corresponding precursors decrease continually with the increasing of preforming pressure.