Gastric cancer has metastasized to the greater omentum and mesentery of abdomen, which means the cancer cells have already spread and belongs to advanced stage, so conservative treatment is recommended. For gastric cancer that has metastasized to the abdominal cavity, surgery can no longer be considered, and it is recommended to carry out intraperitoneal perfusion chemotherapy to kill the cancer cells in the abdominal cavity. If the patient’s physical condition permits, combined systemic chemotherapy can be carried out, and at the same time, HER2 gene examination can be carried out. If FIST shows positive or immunohistochemistry suggests that there is (++++), it is suggested that Herceptin targeted therapy can be used in combination with chemotherapy, so as to achieve the effect of controlling the tumor. A visit to the gastrointestinal surgery department is recommended to evaluate the need for palliative resection of the primary tumor. For patients with abdominal metastasis of gastric cancer, it is recommended to keep a good mindset and actively cooperate with doctor’s treatment to maximize the delay of survival.