Follicular lymphoma does not have a fixed Ki67 value; Ki67 is an indicator that describes the degree of malignancy of follicular lymphoma. The rate of progression of follicular lymphoma needs to be determined by immunohistochemistry, and one of the important indicators is Ki67, which is known as the tumor proliferation index, and is used to indicate the aggressiveness of the tumor as well as the rate of proliferation. The higher the expression level of Ki67, the more active the cell proliferation, the higher the degree of malignancy, and the more prone to recurrence and metastasis; if the Ki67 index is >70%, the tumor is considered to be a more aggressive lymphoma, and if the Ki67 index is <70%, the tumor is considered to be a low-grade aggressive lymphoma. If there is any discomfort, it is recommended to consult a doctor in time and carry out targeted treatment under the guidance of a professional doctor to clarify the cause of the disease.