Peritoneal dialysis (PD) is a safe and reliable modality of renal replacement therapy in patients with end stage renal disease (ESRD). One of the major issues that PD should overcome is its relatively higher technical failure compared with hemodialysis (HD). Dialysate leakage is a common mechanical complication that often lead to technique failure, however, it is hard to diagnose in the most positions. MR peritoneography is a promising method which can reveal the dialysate leakage visually. Here we report a PD patient suffered from dyspnea when she was under PD therapy, the patient was diagnosed with diaphragm leakage by MR peritoneography.