Thymoma type B1, the main effect on the human body is that it has a certain probability of metastasis and invasiveness, low malignancy, good prognosis, but does not exclude the possibility of recurrence. At present, the pathology adopts the WHO histologic typing of thymoma, which is divided into type A, AB, B, and C. The B type is divided into 3 subtypes, of which the B type is divided into 3 subtypes. Among them, type B is divided into 3 subtypes, type B1, type B2, and type B3. Thymoma type B1 is a lymphocyte-rich thymoma, which is a low-grade malignant thymoma. Clinical manifestations often include compression of organs, producing symptoms such as dull chest pain, cough, chest tightness, palpitations, shortness of breath, diaphragmatic paralysis, and jugular vein rage. Thymoma has the possibility of metastasis and invasion, and may have the risk of recurrence after surgical resection treatment, which requires attention to review. It is recommended that patients go to regular hospitals in time and listen to the advice of professional doctors.