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Objective: To research pharmacodynamic effect of Yangganjiejiu prescription on alcoholic fatty liver and its mechanism., Methods: The alcoholic fatty liver models of rats was set up by feeding high fat diet and alcohol. Sixty male SD rats were randomly divided into 6 groups: normal group, model group, low-dose Yangganjiejiu prescription group (0.7 g/kg), medial-dose group (1.4 g/kg), high-dose group (2.8 g/kg) and positive control drug Dongbao Gantai group, 10 rats were in each group., Results: Yangganjiejiu prescription (1.4 and 2.8 g/kg) could significantly reduce alcoholic fatty liver rats' serum and liver tissues of total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol( LDL-C) levels (compared with the model group, P < 0.05) and lower serum free fatty acids (FFA) content (compared with the model group, P < 0.05), and to some extent increase the serum and liver tissues of high-density lipoprotein (HDL-C) levels (but compared with the model group, there was no statistical significance, P > 0.05); It could improve liver function, lower serum AST, ALP and GGT content (compared with the model group, P < 0.05 or P < 0.01), significantly decrease serum and liver tissue MDA (P < 0.01), increase SOD in serum and liver tissue (P < 0.01), alleviate alcoholic fatty on the liver secondary liver pathology, and reduce fatty liver., Conclusion: Yangganjiejiu prescription has preventive and therapeutic effect on alcoholic fatty liver. Its mechanism is closely related to resistance to oxidative damage, reducing blood lipid, protecting liver and lowering transaminase.