The industrial carbon dioxide discharge is a serious problem of the global environment. The biomass is carbon neutral energy and can be used as an alternative fuel. The object of this paper is to cut down the fossil consumption in a small-scale oil-burning furnace by wood powder and A-heavy oil. The wood powder, which has a size of 150 pm and is made of thinned lumber, is blended into A-heavy oil flame. A wood powder nozzle is used to directly supply the wood powder to the flame in the same axial direction. The combustion characteristics are experimentally investigated. As the wood powder increases, the temperature and the calorific value in furnace is increased, CO concentration is decreased. The particulate matter produced by A-heavy oil is significantly decreased. It is found that the wood powder is available to energy saving and emission control.