Following conclusions are made from the detalied research on the relation between the phase change of the petroleum raw cokes after ball milling and the preheat treatment temperature. The petroleum raw cokes species are preheated in the temperature range of 350~45$0^{circ}C$. At the preheat treatment temperature of 40$0^{circ}C$ the particles of petroleum raw cokes from ball milling become spheically shape with the almost uniform particle size distribution of 1~5${mu}{ extrm}{m}$. At the same temperature, they became low-graphitized with the d0.02 X-ray diffraction index of 3.41$AA$. The carbon material made from the petroleum raw cokes at 40$0^{circ}C$ turned out to have the good modulus of rupture about 600kg/$ extrm{cm}^2$, with the bulk density around 1.8g/㎤ and the appearent porosity around 8%.