The ideal diagnostic methods in breast diseases consist of the physical examination and complementary radiolgic examinationl. In radiologic examination mammography is the most popular screening methods and the othersimple complementary method is thermography which is effecient under the conditions of elevated skin temperaturein inflammatory and malignant lesions. From Jan. 1st, 1987 through Jan. 30th, 1988, 110 pts. with complaints of mammary problems were examined by mammography and thermography at Paik hospital, Inje University. The authors selected and analyzed 97 cases had been pathologically proved through the operation and the fine needle aspiration biopsy The result were as follows: 1. The most prevalent age group was 5th decade(40%) in cancer, 4th decade (47%)in mammary dysplasia and followed by fibroadenoma(63%) in 4 th decade. 2. The mammographi can thermographic findings were compared between the mammary dysplasia and the infiltrating ductal cancer. In mammamry dysplasia abnormal hot emissions were appeared in 9/44(17%) correlated with atypical hyperchromatic cytoplasm relates topre-malignant group. 3. We hope and expect the early detection of breast cancer throuth the follow-up study inpre-malignant group of mammary dysplasea.