We used Image Analysis Processor to clarify the relation ship between cell proliferation, apoptosis and inflammation before and after eradication in H. pylori gastritis. Fifty-two patients with H. pylori gastritis were diagnosed using the Rapid Urease Test under endoscopical and histological examination. The grading of gastritis was determined by the Updated Sydney System. While the effects of Ki-67 on epithelial cell proliferation were examined by immunohistochemistry using Image Analysis Processor, and apoptosis in epithelial cells was counted after staining by in situ TDT. H. pylori density, the number of neutrophils, mononuclear cell, and number of lymphoid follicles had significantly decreased after eradication. Ki-67 labeling index significantly decreased from 11.74 percent to 0.98 percent after eradication (p < 0.0001). The apoptotic index had also decreased after eradication, but with a lack of significant difference (p < 0.06). These data suggest that H. pylori gastritis was remarkably ameliorated by eradication, have led to being capable of improving epithelial cell damage, and activity of proliferative cells and apoptotic cells were becoming normalization.