The common examination methods for breast cancer are X-ray, i.e. molybdenum target, followed by ultrasound and magnetic resonance, as follows: 1. Molybdenum target can find out the condition of the lump and the lump, with or without calcification, whether the calcification is fine gravel-like calcification or patchy calcification, and the edge of the lump, whether the edge is rough, whether it is a stellate change, whether the corresponding mammary skin is thickened or not, and whether the nipple is inverted or not; 2. Ultrasound can find out the hematological condition of the lump and whether the lymph nodes in the axilla are enlarged; 3. Ultrasound can find out the blood circulation of the lump and whether the lymph nodes in the axilla are enlarged; 3. Magnetic resonance can find out the condition of the lump itself, as well as the metastasis of distant lymph nodes and organs, which is conducive to the preoperative staging of breast cancer, and it can provide favorable value for the diagnosis and preoperative staging of breast cancer, and at the same time, it can provide valuable references for the clinician to choose the preoperative diagnosis and treatment plan.