Objective: To investigate the two-dimensional ultrasound and color Doppler features of breast cancer. Methods: The two-dimensional ultrasonic imaging characteristics of breast masses were analyzed， including the morphology， border， internal echo， tall to wide ratio and posterior echo attenuation of the masses. Color Doppler imaging then was used to observe the blood flow within and around the masses. According to the color Doppler imaging results， blood flow was divided into four stage: 0、Ⅰ、Ⅱ and Ⅲ. Results: Malignant tumors detected by ultrasound were more frequently found to have the following features: irregular shape (58/64， 91%)， ill-defined margin (52/64， 81%)， heterogeneous internal echo (58/64， 91%)， tall to wide ratio＞1 (61/64， 95%)， posterior echo attenuation (56/64， 88%)， and stage Ⅱ～Ⅲ of blood flow (54/64， 84%). Conclusion: High frequency ultrasound combined with color Doppler imaging is effective method to detect breast cancer in early stage， and it can obviously improve the diagnostic rate of breast cancer.