Expandable graphite is the precursor to preparate exfoliated graphite(EG). Confectioning by compressed column will have an impact on the laser extinction performance of EG exfoliated from it. In order to optimize the performing parameter, a series of preformed graphite intercalation compound (GIC), as the precursor of EGs, were prepared under different performing pressure. And the expanding state, expanding volume (EV), micro-morphology and laser extinction of the EGs obtained from the performed GICs were studied. Experimental results show that compared with the diameter, length and porosity of the EG decrease, and the layers of preformed GIC open deficiently. With the increase of performing pressure, the EV of GIC decreases from 356 ml/g to 216 ml/g, and meanwhile, the laser mass extinction cross section(σM) of EG obtained from GIC decreases from 0.18 m2/g to 0.04 m2/g. But both values of EV and σM drop more slowly at 20-40 MPa, and therefore, it is considerable for a high loading density to choose the upper value of 20-40 MPa as the performing pressure on GIC in EG practical application.