Conventional screening methods: ultrasound examination, molybdenum target X-ray and molybdenum target photography (the gold standard for breast cancer examination, but generally not used for screening). The newly released "Guidelines for Early Diagnosis and Treatment of Breast Cancer Screening in China" by National Cancer Center points out that ultrasound is the first choice for breast examination of women under 40 years old. At present, there are hand-held ultrasound and ABUS automatic volume ultrasound. The latest painless and accurate screening method is GE's ABUS equipment. Compared with molybdenum target equipment ABUS, it is more suitable for oriental women to tighten their breasts and has a higher detection rate.