These studies were carried out to investigate effects of Leonurus sibiricus green juice on gastric secretion of rats and acute toxicity in mice ; $LD_50(mg/kg)$ of Leonurus sibiricus extract was 625mg/kg intraperitoneally in mice. The groups administered green juice and water extract of Leonurus sibiricus showed more excellent increasing effect in total acidity and peptic activity, and decreasing effect on gastric volume than control group. But any differences were not found between sample and control group in gastric pH. It is suggested that Leonurus sibiricus can he used as the bitter stomachics to promote the gastric digestion.