Abstract: The process of MVR technology combined with evaporation crystallization technology in treatment of hypersaline wastewater was modelled and simulated， and the calculated results were in good agreement with experimental data． Meanwhile，the effect of compression ratio and operating pressure on the COP and the heat transfer temperature difference in forced circulation heater were analyzed． The optimum conditions were obtained: Compression ratio was 1. 7 ～ 2 and the operating pressure was 45 ～ 60 kPa． The study results had a guiding significance on optimizing the process parameters of MVR evaporation crystallization system and realizing the zero discharge of hypersaline wastewater．