objective To further study the effect mechanism of Maxing Shigan Decoction in against influenza virus.Methods Using 2-(4-methylumbelliferyl)-α-D-N-acetylneuraminic acid as a substrate, detecting the influenza virus neuraminidase activity of Maxing Shigan whole decoction and Maxing Shigan decoction with different concerted application.Results Compared with the model group, The neuraminidase activity of MXSGD group and herba ephedrae group was decreased by 53.4% and 75.4% respectively; The neuraminidase activity of herba ephedrae with almond...