We have developed a digital phase contrast mammography system in which an acquired image magnified by 1.75 times is printed on a hard copy in a size de-magnified by a ratio of 1.75 in order to obtain an original size image. In this system, spot compression is conducted with 2.65x magnification in acquisition, and then the acquired image is reduced in size by 1.75 times so as to print a 1.5x spot magnified image (2.65÷1.75=1.50). We would like to discuss the image quality of the spot magnification using phase contrast technique.