Lymphoma belongs to the tumor of blood system. Some lymphoma may be related to the metastasis of the tumor, such as breast cancer in women, which can lead to the metastasis of axillary lymph nodes in the corresponding area, but this kind of lymph node tumor is not lymphoma and is called metastatic cancer of lymph nodes. During the treatment of lymph node tumors, the specific cause of the enlarged lymph nodes or cancer should be clarified. Through puncture biopsy or surgical excision, most cancers of enlarged lymph nodes or lymph can be clarified. If the cancer is lymphoma formed by metastasis from tumors of breast, liver, stomach and other organs, only by removing the primary lesion and performing lymph node dissection can the related tumor disease be treated. If it is a tumor of blood system, it will be more sensitive to integrated therapies such as radiotherapy and chemotherapy, and after a period of treatment, it can make the patient survive with tumor for a long time. Therefore, for lymphoma, it is necessary to clarify its pathological diagnosis in order to provide specific treatment plan.