Abstract:The study investigated the effect of five common substrates (soil, sand, a mixture of soil and sand, a mixture of sand and organic matter, and a mixture of sand, soil and organic matter) on evaporation and purification of wastewater in constructed wetland. The evaporation capacities of wastewater in the substrates were different following the order of mixture of sand, soil and organic matter> mixture of mixture of sand and organic matter> sand > soil > mixture of sand & soil. The evaporation capacity was significantly higher in the mixture of sand, soil and organic matter and the mixture of sand and organic matter than in the other three tested substrates (P<0.05),which was related to the substrate temperature. Temperatures of the five substrates were different and the mixture of sand, soil and organic matter had significantly high temperature compared with soil or sand (P<0.05). The temperature of the mixture of sand, soil & organic matter was 2.2℃ higher than that of the soil. The correlation analysis showed that there was significantly positive correlation between the evaporation capacity of wastewater and the removal efficiency of NH4+-N (P<0.05). The addition of organic matter can increase the temperature and evaporation capacity of wastewater in the substrate, which contribute to the enhanced removal efficiency of organic carbon and nitrogen in the wastewater.