For the CO2 reforming of CH4, Ni catalyst was supported on La-hexaaluminate or on r-Al2O3. La-hexaaluminate has been widely used as a catalyst support for high temperature combustion and which shows higher resistance to coke deposition compared to conventional r-Al2O3. The catalytic activities of Ni/La-hexaaluminate catalysts were measured at 700oC using gas chromatography (GC) for 72 h, and the reaction was maintained up to 72 h for the investigation of catalyst deactivation. The surface of each catalyst after 72 h reaction was investigated using SEM and TEM, and the composition of the carbon deposits was investigated by using EA, TPO and TGA. Ni/La-hexaaluminate shows higher resistance to coke deposition than conventional Ni/Al2O3 which seems to be due to strong interaction between Ni and the support material. As a result of the reforming reaction, various types of carbon deposits were created on catalyst surface and the amounts of them were much smaller in the case of La-hexaaluminate than on Al2O3. It is noteworthy that most of the deposits on Al2O3 are carbon nanotubes (CNTs), however different types of carbons such as CHx species, surface carbon, nickel carbide and CNTs were created on La-hexaaluminate.