The aim of this study is to assess the impact of the number of iterations of CS reconstruction on kinetic parameters and the image similarity in DCE-MRI of the breast. Breast examinations include ultrafast DCE-MRI using CS were conducted for 21 patients. The images were reconstructed with different numbers of iterations, and the semi-quantitative and quantitative kinetics parameters were compared. The reconstructed images were evaluated by root mean square error (RMSE) and structural similarity (SSIM) as the quantitative image evaluation. In small number of iteration, the all kinetics parameters were underestimated especially in malignant lesion with hypervascularity.