Object To approach the sonographic features of subcentimeter breast mass and assess the diagnostic value of sonographic findings of subcentimeter breast mass. Methods The sonographic characteristics of 491 breast mass(≤10.0mm) were reviewed retrospectively．The multi-factor binary Logistic regression analysis for predicting the subcentimeter breast mass. Results The shape and vascularity were finally entering the Logistic model. If apply =0.05 as cut-off, the diagnostic accuracy was 95.2%. Conclusion The Logistic model which is based on shape and vascularity can efficiently differentiate malignant subcentimeter breast mass from benign ones.