The fluorescent tracer technique is an effective means to detect the residual quantity of water treatment agent.It introduces the advantages and prospects of fluorescence-labelled water treatment agent and reviews the research on the synthetic methods of fluorescence-labelled water treatment agent ,including physical mixture,polymer modification,fluorescent monomer copolymerization,especially in fluorescent monomer copolymeriza-tion.It also introduces the application of fluorescence-labelled water t...