Abstract: Objective: To investigate the value of B-ultrasound and molybdenum X-ray in the diagnosis of breast nodules. Methods: Eighty patients with breast space occupying were detected with B-ultrasound and molybdenum X-ray examination. The diagnostic results and the clinical and pathological findings were compared to confirm the breast tumor. Results: The coincidence rate of B-ultrasound diagnosis and clinical and pathological conditions was 90%. The coincidence rate of B-ultrasound in the diagnosis of fibroadenoma was higher than that in molybdenum X-ray( P 0. 05). The coincidence rate differences of B-ultrasound and molybdenum X-ray in the diagnosis of breast cyst,mammary gland hyperplasia and breast cancer had no statistical significance( P 0. 05). Conclusions: Bultrasound is high accuracy,no radiation damage and lower price,which has an important value in the dignosis of breast neoplasms.