Optical Brightener DMS is regarded as one of the perfect agent used in detergent industry. Owing to introducing the morphonline group into the mplecular, the properties such as acid and perborate resistence be improved. It can be used in the whitening of cellulse fiber, polyamide fiber and fabrics, showing nocnic charaters and has opticas blue color. It has better resistence to chloride bleaching than VBLand 31#, the most facorable dyeing bath pH valce is 7-10. Itl sunlight fastness is 4grade, the most adcantage used in detergent industry is its high matching capacity in detergent industry.