Ammonia stripping parameters optimized by Aspen Plus are introduced.The second absorption type hot pump is adopted for ammonia stripping technology by using energy-saving hot pump,which will recover the latent heat of ammonia vapor from the top of the ammonia stripper.Compared with the conventional ammonia stripping,this optimized technology can not only ensure the NH3-N content no higher than 100 mg/L in the stilled water at bottom of the stripper,but also dramatically decrease the L.P.steam consumption during ammonia stripping,i.e.no higher than 100 kg/h for treating per ton of coal water.