Abstract: In this study,phosphoric acid as activiting agent and leaf residual of Cinnamomum longepaniculatum as raw material were used to prepare activated carbon,and analysis was made of the effects of solid-liquid ratio, heating rate, activation temperature and time on the characteristics of activated carbon. The results showed that the optimal processing conditions were as follows:solid-liquid ratio 1:3, activation temperature 420℃,activation heating rate 60℃·min^-1 and activation time 60 min. Under these conditions, the yield of the activated carbon produced by leaf residual of Cinnamomum longepaniculatum was was 36.5%, the specific surface was 1 107 m²·g^-1, the methylene blue adsorption value was 160 mg·g^-1, and the iodine adsorption value was 935 mg·g^-1.