There are two kinds of main pollutants (NO_x and Dioxins) which can be controlled by municipal refuse combustion procedure improvements. The reduction phenomena of both of them are completely different, so that appropriate combustion condition must be considered separately. The basic theory to decrease NO_x is to make self de-NO_x combustion area and to maintain longer residence time in this area by decreasing primary combustion air supply. Also it is required for low dioxins combustion to maintain high furnace temperature and longer residence time in this area by decreasing combustion gas volume and well mixing of unburned combustion gas and air. We present in this paper the experimental results to determine the lower limit volume of primary combustion air, using over fire air and/or recirculated combustion gas injection into furnace and oxygen enriched primary combustion air supply. The best result would be presented by actual scale municipal refuse incineration test. The combination of oxygen enriched primary combustion air, recirculated combustion gas injection into lower furnace and overfire air injection into upper furnace can decrease NO_x and dioxins simultaneously.