Clinical breast examination (CBE), ultrasonography (US) and mammography (MMG) have been used as a standard breast cancer screening methods in the practice of Automatic Multiphasic Health Testing and Service (AMHTS) . Of 12, 950 subjects screened, 855 cases (6.6%) were recalled for a close examination and the examination were performed in 681 cases (80.0%) . As a results, 58 cases (0.45%) were diagnosed as having breast cancer, and 38 of them were in the early stage of the cancer (66.7%) . In the 58 cases detected, the detection rates with CBE, US and MMG were 29.3%, 86.3% and 75.9%, respectively. In the 38 subjects of early cancer, the detection rate for CBE, US and MMG were 17.9%, 84.6% and 71.8%, respectively. The sensitivity was the highest in US. The detection rate with CBE was remarkably lower than US. All subjects detected with CBE were detectable with US.