Inclusion Criteria:  Subject has been diagnosed as PAOD by symptom and imaging; Subject intends to take endovascular treatment in PUMCH; Subjects without heavy stenosis in infrapopliteal artery (stenosis<30%), or with short length lesion(length≤5cm, stenosis≥30%); Age > 35 and < 80; Subject has been informed the study and has signed informed consent;  Exclusion Criteria:  Subject with MRI contraindications or allergic to iodinated contrast medium; Subject underwent intervention therapy or angioplasty in target vessel within the last 3 months; Subject after stent implantation in superficial femoral artery; Subject with severe heart dysfunction, renal dysfunction, or cancer;