Rectal neuroendocrine tumor G1 is not very serious and is a potentially malignant tumor, but early diagnosis and treatment have a better prognosis. Rectal neuroendocrine tumors are neuroendocrine tumors that occur in the rectum and originate from neuroendocrine cells (APUD) cells. It mostly manifests as nonspecific gastrointestinal symptoms such as abdominal pain, blood in the stool, and changes in bowel habits. Its diagnosis relies on meticulous endoscopy and biopsy. In rectal neuroendocrine tumors, G1 is the histological grading based on immunohistochemical results. G1 criteria are Ki67 ≤ 2%, nuclear schizophrenia ≤ 1/10HPF, and its tumor proliferative activity is lower, and the degree of malignancy is lower than that of the G2 and G3 grades. Rectal neuroendocrine tumor grade G1 has certain potential malignancy, and the onset of the disease is more insidious, the clinical manifestations have no specificity, easy to miss and misdiagnosis. However, it grows slowly and has a long course, and has a better prognosis if diagnosed and treated at an early stage. It is recommended that the patient should consult the doctor for further examination and surgery if necessary.