In order to compare endoscopic findings with macroscopic and microscopic findings in the resected stomach, an improved endoscopic China ink injection method, "mucosal injection method", was studied. The materials were ninety-three resected cases of gastric carcinoma and a following-up case of gastric erosion. The plastic-made and disposable syringe (Figure 2-C, the capacity of 1ml) was better than the other syringes. An undiluted China ink was best in four kinds of coloring materials (Table 1). 1.5 mm long fiberscope injector's needle (Figure 3-B) was better than the other length needles in jnjecting China ink into the mucosa alone (Table 2). Comparing 0.01 ml with 0.005 ml volume at one injection, the remaining rate of black spots was the same (Table 3) but the spots of 0.01 ml were clearer (Figure 4, 5). The mucosal spots made with China ink were seen black in color on the endoscopy (Figure 9) and the macroscopy (Figure 10), and many black granules of China ink were seen to be localized in the gastric mucosal stroma on the microscopy (Figure 11). A clear black spot remained black one year and nine months after China ink injection near the gastric erosion in the antrum (Figure 6, 7, 8). With the improved China ink injection method, we can obtain a very small clear mark remaining for a long time. Therefore, this method seems very useful for the studies of comparing endoscopic findings with macroscopic and microscopic findings and examining the course of gastric lesions.