Staging laparoscopy was carried out for 12 cases of advanced primary gastric cancer to evaluate the condition of peritoneal seeding. Peritoneal seeding was indicated in five cases. Abdominal lavage sampling was positive in six cases. Among six cases with positive cytology, surgery was adopted in three cases to lessen bleeding or stricture. Chemotherapy were carried out for the other three cases. Radical lymph node resection was carried out in six cases without peritoneal seeding. Laparoscopic observation was easier and more feasible under general anesthesia than local anesthesia. Preoperative staging laparoscopy for advanced gastric carcinoma can evaluate the condition of peritoneal seeding. Based on the results, a suitable treatment plan for each patient can be determined.