Abstract: 【Abstract】　Objective 　To explore the diagnostic significance of mammography in non－palpation breast lesions (NPBLs) . Methods 85 patients with non－palpable breast lesions were randomized into A group (to examined with sonography,42 cases) and B group (to examined with mammography,43 cases ).To get all the breast neoplasms’ biopsy through punctura or on operation and have the pathological diagnosis.Then to analyze the result. Result The breast carcinoma’ s detection rate of group A was lower than that of pathological diagnosis（68.75% VS 95.83%，P < 0.05）,but the breast cancer’ s detection rate of group B has no significant difference with pathological diagnosis（86.27% VS 96.08%,P ＞ 0.05）. To examined the breast lesions with mammography has more accuratation (90.2% VS 72.92%)，sensitivity(89.8% VS 71.74%)，breast cancer’ s positive rate (89.8% VS 71.74%)and cut edge’s negative rate(98.04% VS 85.42%)（P < 0.05）. Conclusion Mammography and sonography , especially mammography which has some superiority , play an important role in detection , diagnosis and treatment of non－palpable breast cancer in early stage.

Key words: mammary, breast neoplasms, palpation, ultrasonography, mammography, biopsy