Objective To explore the best imaging sequence of fetal lung in MRI, and to study the clinical application of fetal lung imaging in MRI. Methods SSh-T2WI and B-FFE scans of 54 pregnant women with middle and late pregnancy were performed to evaluate the image quality, blur degree, signal to noise ratio (SNR) and contrast noise ratio (CNR) of fetal lung in the two series. Results SSh-T2WI sequences obtained higher scores in fetal lungs in grading evaluation.In quantitative analysis, normal fetal left lung and right lung in the SSh-T2WI sequence were (1.87±0.33) and (1.92±0.29), (1.33±0.39) and B-FFE sequence is (1.31±0.31). The fetal left lung right lung in the lesion group was (1.83±0.29) and (1.80±0.22) on the SSh-T2WI sequence, and the B-FFE sequence was between (1.30±0.22) and (1.32±0.25). The CNR SSh-T2WI sequence of fetal lung and fetal liver was (1.68±0.8) than B-FFE's (1.01±0.71). Conclusion SSh-T2WI sequence in MRI examination can clearly show the anatomy of fetal lung and placenta of the obtained images with high image contrast, can be used as the preferred sequence of fetal lung imaging.MRI can clearly show the fine structure of fetal lungs and surrounding organs, can directly and accurately diagnosis of fetal respiratory system disease.