Mono-ethylene glycol Recovery Unit (MRU) is an important part of deep-water oil and gas field development project. This paper introduced the origin, application status and classification of MRU, analyzed and compared the similarities and differences between full desalination MRU and conventional MRU, expounded the desalting principle and key equipment, and finally forecasted the development trend of MRU. The research on the application of MRU in deep-water platform provides a new experience for optimizing the mono-ethylene glycol regeneration process and improving the efficiency of mono-ethylene glycol regeneration system. The conclusion of this research is that China needs to make more efforts in many directions to accelerate the localization of technological process of MRU.