Objective To analyze the effect of MRI in the estimation of pelvic floor dysfunction in early stage of pregnant woman after delivery. Methods 38 pregnant woman with pelvic floor dysfunction in early stage after delivery in our hospital from May 2014 to May 2016 were selected as the observation group, 30 pregnant woman with normal pelvic floor function in our hospital in the same period were selected as the control group, MRI inspection travers, sagittal position, coronal scan data and image results in the two groups were analyzed. Results Dynamic, static MRI inspection travers iliococcygeal muscle, musculi pubococcygeus, musculi puporectalis area in the observation group were significantly less than the control group (P<0.05), dynamic, static travers widths of levator hiatus, dynamic, static sagittal position LH line, M line length were significantly greater than the control group (P<0.05), dynamic, static coronal scan MRI angle of anal sphincter were decreased significantly (P<0.05). Conclusion Anatomical structure of pelvic floor of patients with pelvic floor dysfunction in early stage in MRI image have significant difference from normal female, dynamic, static MRI scan can reflect pelvic floor function and change of form of pregnant woman with pelvic floor dysfunction in early stage after delivery, which helps to the estimation and diagnosis of degree of pelvic floor dysfunction after delivery.