The enzymatic activity of serum glutamic-pyruvic transaminase is influenced by the addition of ginseng into diet at one percent level and the difference between the treatments is significant. at the same level of dietary protein, ginseng decreases slightly this enzymatic activity. Serum glutamic-oxaloacetic transaminase activity is highly influenced by dietary ginseng in rats administered with ethanol. The feeding of this plant to rats maintained with a same level of dietary protein significantly reduced its enzymatic activity. A similar tendency is also observed with the increase of dietary protein level. Both the addition of dietary ginseng and the increase in dietary protein level exert a profound influence on the enzymatic activity of serum lactic dehydrogenase, indicating that ginseng really hase protective effect on liver from deterioration caused by a prolonged and repeated ethanol ingestion.