The most common benign breast tumor is fibroadenoma, while other tumors include lipoma and malignant tumor. Some foreign experts, including domestic experts, hold the concept of maintaining observation without surgery for benign tumors such as fibroadenoma. However, whether each individual should receive surgery or not should be analyzed on a case-by-case basis. In our breast department, we have recently operated on two cases of large benign breast tumors. One was a 33-year-old patient who found a breast lump for 7 years, which grew to a tumor diameter of 12 cm and was eventually pathologically diagnosed as a malformation tumor. One case was a 54-year-old patient who found a breast lump for 5 years, grew to 10 cm, and the final pathology was adenolipoma. Although, the pathologies were all benign, the huge tumor would leave a larger surgical incision and the appearance of the breast would be altered by more removed tissue. Therefore, for patients suffering from benign tumors who do not want to have surgery for the time being, they must be followed up with regular review. If a tendency of growth is found, or if ultrasound reveals abundant blood flow signals around the mass, it is still advisable to have surgery. For young patients with fibroadenoma, the latest deadline is to receive surgery before pregnancy.