Cylindrical and annual carbonaceous precursors were activated by partial steam or CO2 gasification. Micropore and mesopore structures of the activated C samples with various burn-off were evaluated by N-2 adsorption/desorption isotherms. Parameters of the Dubinin-Radushkevich equation were calculated, surface mesopores were detd. by the Dollimore and Heal method, as well as the micropore size distribution from the Horvath-Kawazoe equation. The annular C samples showed a uniform micropore structure and better mech. properties than the cylindrical ones.