Thymoma type b1 is a more serious disease. Thymoma belongs to malignant tumors, and type b1 refers to the pathological typing of thymoma, including lymphocyte-rich thymoma, lymphocytic thymoma, and cortical-dominant thymoma. Thymoma type b1 is mostly manifested as stage II or III clinically, because the growth of this thymoma often breaks through the peripheral growth and infiltrates with the surrounding tissues, and when resected, there is a possibility that the resection may be incomplete, and may recur or metastasize after surgery. If not treated promptly and aggressively, it may cause symptoms such as superior vena cava syndrome, pericardial tamponade, and spinal cord compression. If thymoma type b1 is early, it can be removed by radical surgery, and some patients with postoperative metastasis or those who are found to be in advanced stages can receive chemotherapy and targeting. It is recommended that patients with thymoma go to the hospital in time and listen to the advice of professional doctors.