Objective:The mechanisms of antiulcer effects of decoction Yiqi Huayu were investigated.Methods:By measure the content of the combination of gastric wall with mucus,DNA,SOD,MDA and PGE 2 we observed that the effects of precedingly offering Chinese drugs(20?10 or 5 g/kg×7 d,ig) on the gastric ulcers in rats induced by stress,alcohol,Indomethacin, and pyloric ligation, and that the cure of acetic acid induced gastric ulcer after continuously using these drugs 8,18,and 26 days.Results:By incresing the combin...