Most architectural waste wood contains preservative-treated material, and one of the most Popular preservatives is CCA, which contains chromium, copper and arsenic oxide. This work was conducted to examine the gasification characteristics of charcoal derived from CCA-treated waste wood for production of fuel gas from architectural waste wood. Charcoal from CCA-treated wood was gasified by using a thermobalance-type reactor under CO2 atmosphere, and the behavior of chromium, copper and arsenic during carbonization and gasification, and the influence of these components on gasification of the charcoal were examined. The experimental results revealed that the metals included in the CCA reagent, particularly copper, decreased the activation energies for CO2 gasification of the charcoal. During carbonization and gasification, it was confirmed that the arsenic were escaped from the wood and charcoal, while the copper and chrome ware completely concentrated in the gasification residual ash.