Abstract: This study aimed to explore the effect of reclaimed water on the changes of ammonia and main salinity concentration in groundwater. Qinghe reclaimed water wetland park was chosen as a case, ammonia nitrogen and Cl-ion are the main research object, using Hydrus-1D solute transport model and coupling groundwater model of Modflow and MT3DMS, the change of ammonia nitrogen and Cl^- index after the long-term utilization of reclaimed water was simulated. At the bottom of vadose zone, the content of nitrogen ammonia and Cl^- ion in reclaimed water was higher than that of phreatic groundwater in the research area, ammonia nitrogen was beyond groundwater quality Ⅲ class standard. The coupling model prediction results suggested that concentration area of ammonia nitrogen exceeding the groundwater quality standard would has expanded constantly 5~20 years later in the horizontal direction, and has extended vertically to the first layer of weak permeable layer; the Cl^- ion concentration would not exceeding the quality standard but has increased in phreatic groundwater surrounding the wetland park. So the long-term reinjection of the reclaimed water in wetland park will have a negative impact on the local groundwater quality.