According to the 2015 edition of the Expert Consensus on the Diagnosis and Treatment of Gastrointestinal Mesenchymal Tumors in China, the risk of recurrence after surgical resection of primary gastrointestinal mesenchymal tumors is usually graded, and can be divided into four levels: very low risk, low risk, moderate risk and high risk. Very low risk: the tumor can originate at any site, the tumor size is <2cm, and the number of nuclear splitting images per 50 high magnification fields is ≤5; 2. Low risk: the primary tumor at any site, the tumor size is 2.1-5cm, and the number of nuclear splitting images per 50 high magnification fields is also ≤5; 3. Medium risk: the primary site of the tumor occurs in the stomach, and the tumor size is 2.1-5cm. The size of the tumor is 2.1-5cm, and the number of nuclear splitting images per 50 high magnification fields is >5. The primary tumor of any site, tumor size <5cm, and the number of nuclear schizograms per 50 high-powered field of view is between 6 and 10. Tumors with primary site in the stomach, tumor size 5.1-10 cm, and the number of nuclear splitting images per 50 high magnification fields ≤ 5 also belong to the moderate risk level; IV. High risk level: It refers to any size of tumor, any number of nuclear splitting images, as long as the tumor has ruptured is classified as high risk level. In addition, this grade includes the following five cases: 1. the tumor originates in any site, the tumor size >10cm, and the number of nuclear schizophrenia can be any value; 2. the tumor originates in any site, the tumor can be any size, and the number of nuclear schizophrenia per 50 high magnification fields >10; 3. the tumor originates in any site, the tumor size >5cm, and the number of nuclear schizophrenia per 50 high magnification fields The primary site of the tumor was of non-gastric origin, the size of the tumor was 2.1-5.0 cm, and the number of nuclear splitting images per 50 high magnification fields was >5; 5. The primary site of the tumor was of non-gastric origin, the size of the tumor was 5.1-10 cm, and the number of nuclear splitting images per 50 high magnification fields was ≤5.