The impacts of two hydroponic plants (Cyperus alternifolius and Canna generalis) and the apple snail (Pomacea canaliculata) on nutrient change behaviors and kinetics of alkaline phosphatase in eutrophic water were studied in this paper. A mesocosm experiment contained six different treatment systems was conducted from October to November 2014. The total removal rates of C. alternifolius and C. generalis for total nitrogen (TN), total phosphorous (TP) and chlorophyll a (Chl-a) contents were 74.9%, 79.8%, 85.9% and 70.9%, 79.2%, 83.0%, respectively, and the function of organic P hydrolysis decreased as well, in terms of the lower velocity of reaction (lower V-max) in overlying water combined with lower affinity for substrate (higher Km values) in interstitial water and surface sediment. On the contrary, the snails exhibited an activation on alkaline phosphatase in water body (higher V-max and lower Km values), interstitial water (higher V-max) and sediment (higher V-max), despite the high P concentrations in these mesocosms. No obvious correlation was found between orthophosphate (PO43--P) and alkaline phosphatase activity (APA) in our study, indicated that the "induction-repression" mechanism did not work in hypereutrophic water. Additionally, a remarkable feature is that snails coupled with plants would aggravate eutrophication in water column, due to the grazing of snails on plants as their food source. Our study highlighted to investigate the enzymology mechanism of macrophyte-snail-phytoplankton systems and to give some implications on the restoration of eutrophied water by using floating-bed systems.