Polyphosphates as a kind of important water-holding additive were widely applied to the processing of aquatic products. However, polyphosphates can be hydro lydzed after being added to the muscle, which brings about weaking its functionality and the difficult of detection. In this paper, we aimed at solving problems about detection of polyphosphates in seafood and easy hydrolysis. So we established a method of detecting polyphosphates in aquatic products, and used UHP to make polyphosphatase inactivate in o...