Abstract: Bamboo charcoal was modified by Nano- TiO2. The properties and structures of modified bamboo charcoal were investigated by FT-IR, EPR and SEM. According to the results, TiO2 could be loaded on the brim and surface of the pores in bamboo carbon without blocking them. The amount of non-conjugated electron in modified bamboo charcoal was raised from 8.7 × 1013 to 8.9 × 1017. Purification of benzene in atmosphere by modified bamboo charcoal was determined by GC. The results indicated that modified bamboo charcoal could degrade benzene into carbon dioxide and water. The best efficieney of degrading benzene was obtained under ultraviolet irradiation. When the content of TiO2 reached 3% , the purification rate was up to 93.50% using modified bamboo charcoal for 12 hours.