Experimental study on NOx release from superfine pulverized coal combustion and the effect factors such as particle size, temperature, stoichiometric ratio, coal sort, etc. are carried out. Results show that NOx release concentration of superfine pulverized coal decreases comparing with the normal pulverized coal size;NOx emission increase obviously with the uncrease of stoichiometric ratio ;NOx release behavior is different for different coal types, the quantity of NOx release from superfine pulverized coal is lower obviously for longkou lignite, but maintains nearly no change for jincheng anthracite; as the temperature in furnace increases, NOx emission also increases.