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<span lang="EN-US">The activated carbons with well-developed microporosity were prepared from fir wood (<em>Cunninghamia lanceolata</em>) impregnated with small amounts of phosphoric acid (impregnation ratios, 1.5–4.5 wt.%). For comparison purpose, a parallel study of fir wood without impregnation was carried out in the same conditions. The results showed that the addition of small amounts of H₃PO₄ could lower the thermal decomposition temperature of fir wood and significantly promote the adsorption capacity and the yield of activated carbon. The yield without phosphoric acid impregnation was 6.55 wt.%, which rose to 19.82 wt.% in the case of 3.0 wt.% H₃PO₄ impregnation. Using small amounts of phosphoric acid as additive was beneficial to improve specific surface area (<em>S</em>_BET) and micropore volume (<em>V</em>_mic), and could produce activated carbons with well-developed microporous structure. With 3.0 wt.% H₃PO₄ impregnation, <em>S</em>_BET and <em>V</em>_mic of the activated carbon reached as high as 1281.6 m²/g and 0.535 mL/g, the ratio of <em>V</em>_mic/<em>V</em>_tot (total pore volume) was higher than 80 %.</span> <p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.24.4.18999">http://dx.doi.org/10.5755/j01.ms.24.4.18999</a></p>