Inclusion Criteria:  single lesion detected by gastroscopy and clearly diagnosed histologically as gastric adenocarcinoma. patients with gastric cancer with clinical stage T1N0M0 (based on the TNM stage of the 8th edition of AJCC) (T-stage assessed by ultrasound gastroscopy and N-stage and M-stage assessed by enhanced CT). tumor length diameter less than 3 cm. 4. the lesion is located in the gastric sinus.  5, patient age greater than 20 years and less than 80 years. 6、ECOG score of 0 or 1. 7, The patient voluntarily participated in this clinical study.  Exclusion Criteria:  1， Patients with gastric cancer suitable for endoscopic treatment (differentiated gastric cancer with tumor length diameter less than 2 cm and located within the mucosa).  2, cardiopulmonary dysfunction that cannot tolerate laparotomy. 3, pyloric duct gastric cancer. 4，Previously undergone upper abdominal surgery. 5, other malignant tumors diagnosed within the previous five years. 6，Pregnant women.