Abstract: Objective To observe the effects of Jiaweisini dispersion (JWSNS) on the ultrastructure of gastric mucosa, the content and gene expression of gastric antrum tissue gastrin receptor (GASR) and jejunal tissue vasoactive intestinal peptide receptor 2 (VIPR2) in chronic stress gastric ulcer rats, and to elucidate its mechanism. Methods 60 Wistar rats were randomly divided into normal group, model group, JWSNS large, medium, small dose groups, and omeprazole group, 10 rats in each group. Chronic stress method was used to establish the stress ulcer rat model. The every rat in JWSNS small, medium, large dose groups were gavaged with 0.25, 0.5, 1.0 g/mL Chinese medicine Decoction on 2 mL respectively daily, rats in omeprazole group were gavaged with 0.3 mg/mL omeprazole solution on 2 mL daily, rats in normal group and model group were gavaged 2 mL NS daily. After modeling was end, transmission electron microscopy (TEM) was used to observe gastric mucosa cells and intercellular connections changes of ultrastructure of glandular stomach area and immunohistochemical method and Real time-PCR method were used to detect the protein content and gene expression changes of gastric antrum tissue GASR and jejunal tissue cell VIPR2. Results TEM observation demonstrated that in the normal group the gastric mucosa epithelial cells connected compact, cell membrane integrity, cell nuclear shape and size was normal; in model group rats the gastric mucosal cells were severely damaged; the rats in the rest treatment groups were better than those in the model group in different degree. After The treatment of JWSNS and omeprazole, the expression of CM(155mmGASR protein and mRNA in gastric antrum tissue were increased when compared with that of model group (P<0.05), the expression of VIPR2 protein and mRNA in the jejunum tissue were lower than that of the model group (P<0.05). The expression of GASR, VIPR2 protein and mRNA in the JWSNS large dose group was closed to the normal group with no significant difference (P>0.05). And compared with omeprazole group and JWSNS small dose group, expression of GASR protein and mRNA in high dose group rats were increased (P<0.05), and expression of VIPR2 protein and mRNA were decreased (P<0.05). Conclusion JWSNS can significantly improve microscopic pathologic morphology of the gastric mucosa cell in gastric ulcer of chronic stress rats models, and can through two aspects of inhibiting damage factor and enhancing defense factor to adjust the content and gene expression of gastric tissue GASR and jejunal tissue VIPR2. 【Key words】