Gastric ulcer is a kind of common disease. Recently, bismuth compounds such as bismuth subcarbonate(BSC), bismuth subnitrate (BSN), bismuth subsalicylate(BSS), colloidal bismuth subcitrate (CBS), ranitidine bismuth citrate (RBC) and bismuth subgallate(BSG) are widely used for killing Helicobacter pylori(Hp) and treating gastric ulcer because of their advantages of killing Helicobacter pylori directly, overcoming the idiopathy tolerance of Helicobacter pylori to the antibiotics and preventing the secondary t...