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The new rejuvenation chemicals treatment is introduced in this paper.This chemical treatment can repair the deteriorated RO membranes, and recover the salt rejection ratio immediately.In the past, such kind of rejuvenation methods have been developed and reported only with table test basis and pilot plant test basis.This report describes the feature of the newly developed rejuvenation chemical treatment for the performance deteriorated SWRO membranes.The new rejuvenation chemicals (hereafter RC) have totally different features compared with the ones previously referred.The RC features are: 1) On site treatment.It dose not need to unload the membranes from the pressure vessels.2) RC is applied only after cleaning.The continuous dosing of RC chemicals is not necessary.3) RC chemicals are based on the food additives grade.So it provides safe handling for the plant maintenance works.RC improved the rejection of SWRO membrane which was deteriorated by NaC1O up to 92.5% froom 83.3%.We concluded that RC is effective for SWRO same as BWRO.