Gastric smooth muscle tumor is the most common benign mesenchymal tissue tumor of the stomach. It is most commonly seen in middle-aged people, with a male to female incidence ratio of 1.3:1. Symptoms: Bleeding is the most common symptom, which can cause vomiting of blood or black stool. Other symptoms include epigastric pain, fullness and discomfort. Other symptoms include upper abdominal pain, fullness and discomfort. Diagnosis: The diagnosis of gastric smooth muscle tumor is mainly based on X-ray and gastroscopy, in addition to the medical history and clinical manifestations. Treatment: Since it is difficult to differentiate smooth muscle tumor from smooth muscle sarcoma, and smooth muscle tumor can become malignant, surgical treatment is appropriate. Generally, extensive local excision is chosen, and the margin should be at least 2-3 cm from the edge of the tumor. If malignancy is suspected, a major gastrectomy or total gastrectomy should be performed. For larger smooth muscle tumors (≥5cm in diameter), they must be treated as malignant tumors unless the true nature of the tumor can be confirmed by final pathological examination and other methods.