In this paper,a study is conducted for simulation of ammonia spray structure in two-stage absorber for DeSOx and DeNOx of waste flue gas by active carbon process.Based on the results from pilot tests and by adopting CFD simulation,a new streamline technology is studied,i.e.a big range of flow rate-concentration waste flue gas is uniformly mixed with air-NH4 mass fraction and evenly distributed by regulating mixed fraction supply and optimizing ammonia nozzle arrangement so as to improve the uniformity of ammonia distribution above the nozzles.