Landfill leachate is a kind of wastewater with extremely complicated composition. The content of CODcr, ammonia nitrogen and heavy metals are very high. In recent years, the use of two-stage DTRO technology to treat landfill leachate has become a very effective method. As a mature enterprise specializing in membrane leachate treatment, Jiarong has rich experience in DTRO membrane application and has achieved more than 200 DTRO project. After successful development in partnership with several leachate engineering companies and design institutes. The process of reducing the concentration of NF-RO concentrated liquid by using DTRO membrane technology was implemented. The process is simple and reliable, no pretreatment is required, and the effluent reaches the standard stably.