Objective To evaluate the role of dynamic contrast-enhanced magnetic resonance in the breast-conserving operation for early breast cancer.Methods Clinical data of 42 patients with early breast cancer were retrospectively analyzed.Pathological diagnosis was used to estimate the surgical margin or number of sentinel node.The effect of breast dynamic contrast-enhanced magnetic resonance and breast doppler ultrasonography in the breast conserving operation was analyzed and compared.Results The morphological accuracy and efficiency of preoperative evaluation in the doppler ultrasonography was lower than that in the dynamic contrast-enhanced magnetic resonance(P<0.05);The primary negative margin rate,determine rate of minimally extent and sentinel node dissection rate of the oncological excision in the dynamic contrast-enhanced magnetic resonance was better than those in the doppler ultrasonography(P<0.05).There was no significant difference between the breast dynamic contrast-enhanced magnetic resonance and pathological examination in the evaluation of tumor size(P>0.05).Conclusion The breast dynamic contrast-enhanced magnetic resonance has advantages in preoperative evaluation of breast conserving operation with good safety and feasibility,and is worthy of clinical promotion.