Breast cancer tumor markers include glycoantigen 125, glycoantigen 199, and carcinoembryonic antigen. These tumor markers play an important role in monitoring the progress of breast cancer and understanding the efficacy of treatment. Breast cancer tumor markers are used clinically as an auxiliary reference index to determine the prognosis or development of breast cancer disease. Since the changes of some tumor markers appear earlier than those of imaging, more breast cancer patients will observe the changes of tumor markers through blood test, so as to initially determine whether they are suffering from breast cancer or whether there is a possibility of recurrence of breast cancer. However, tumor marker test cannot be the gold standard for judging cancer. For patients who suspect that they have breast cancer, they need to be diagnosed through clinical physical examination, imaging examination and ultrasound examination.