Total Nitrogen is one of the important indicators for evaluating water eutrophication and an indispensable testing index for aquaculture. Here, we compare different detection methods to explore their advantages and disadvantages in water quality monitoring by using total organic carbon/total nitrogen analyzer, industrial standard (HJ 636—2012) and national standard GB/T 12763.4—2007. Finally, a simple, rapid, accurate and environmentally friendly method was proposed for the detection of aquaculture water quality.[Chinese Fishery Quality and Standards, 2023, 13(3)：35-42]