Objective To evaluate the diagnostic value of color Doppler blood flow imaging(CDFI) combined with two dimensional ultrasonography in the early breast cancer.Methods Forty five cases of breast mass(≤2 cm) were studied with CDFI and two dimensional ultrasonography.Results There were 21 cases with breast cancer and 24 cases with benign breast masses rich blood flow was demonstrated in 20 cases of breast cancer and in only seven cases of benign breast mass on CDFI.The Resistance index(RI)in the breast cancer group was higher(0.70?0.06)than that in benign breast mass group(0.60?0.06)(?