Abstract: Objective To explore the clinical value of high-frequency color Doppler ultra-sonography in identifying axillary metastatic and benignant lymph nodes of breast cancer.Methods 106 axillary enlarged lymph nodes of 78 patient with breast cancer were retrospectively analyzed by high-frequency two-dimensional ultrasonography combined with color Doppler flow imaging (CD-FI).The sonograms and characteristics of blood flow were compared between 56 axillary metastatic enlarged lymph nodes and 50 axillary benignant enlarged lymph nodes.Results There were signifi-cant differences of L /S,thickness-increased characteristics of skin texture,presence or absence of confluent shape and calcified plaque,distribution characteristics of blood flow signals and degrees of blood flow between axillary metastatic and benignant enlarged lymph nodes of breast cancer.Conclu-sion Axillary metastatic enlarged lymph nodes of breast cancer are greatly different from axillary benignant enlarged lymph nodes in the shape,internal echo and blood flow patterns.High-frequen-cy color Doppler ultrasonography is a useful method with higher clinical application value for identi-fying axillary metastatic and benignant enlarged lymph nodes of breast cancer.