Abstract: Heart diseases can increase the risk of pregnancy. The feature of pregnancy is the change of multiple organs and systems, and the safety of fetus should be considered in the process of diagnosis. Cardiac magnetic resonance (CMR) imaging has the advantages of no radiation and trauma, which can not only well display the structures and functions of the heart, the characteristics of myocardial tissue, blood flow, and myocardial scar and fibrosis, but also provide the references for the risk stratification and prognosis of the disease. At present, CMR plays a more and more important role in diagnosis of congenital heart disease, valvular heart disease, coronary artery disease, cardiomyopathy and other cardiovascular diseases. This study reviewed the progress in application of CMR in pregnant women with heart diseases.