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A composite slurry containing yellow phosphorus and phosphate slurry was used to remove NO x from flue gas, where yellow phosphorus is considered to promote generation of ozone from oxygen. The latter can oxidize NO to form more water-soluble N x O y species, finally converted to HNO 2 and HNO 3 . These acids can react with phosphate slurry to form PO 4 3− . Thus, the final solution containing NO 3 − and PO 4 3− can be potentially used as raw material for the production of nitrogen phosphorus compound fertilizer. Moreover, effects of various parameters on NO x removal efficiency were optimized, and singlefactor experiments together with response surface optimization were applied for optimizing these parameters. It was indicated that the removal efficiency of NO x can obtain 99.2% under optimal conditions. Subsequently, the corresponding reaction mechanisms were discussed. Therefore, using the mixtures of yellow phosphorus and phosphate slurry as absorbent not only obtains high NO x removal efficiency, but can avoid the need to dispose of spent liquid wastes, which provides an attractive approach for controlling NO x . Moreover, the present slurry system can eliminate NO x and SO 2 simultaneously with high removal efficiency.