Diabetic cardiomyopathy( DCM) is a major complication of diabetes and is a common cardiovascular complication independent of coronary artery disease and hypertension．Trial to assess of myocardial injury in recipients of simultaneous pancreas and kidney transplantation by nuclear magnetic T２ mapping technology.

1. Evaluate the changes of myocardial injury before and after SPK by cardiac magnetic resonance imaging (CMR),
2. Evaluate the value of SPK in the repair of myocardial injury by comparing with the single renal transplant in recipients with diabetic nephropathy.

Inclusion Criteria:

1. patients with type 2 diabetes were treated with SPK; 2.No definite history of cardiovascular diseases (such as congenital heart disease, coronary heart disease, cardiomyopathy or valvular heart disease, etc.); 3. Preoperative hemodialysis 4. No history of heart failure

Exclusion Criteria:

1. Contraindications in cardiac magnetic resonance imaging；2.poorly controlled hypertension；3.CMR examination revealed marked hypertrophy of the left ventricular myocardium

A total of 25 patients with SPK who met the inclusion criteria and 25 patients with simple kidney transplantation for diabetic end-stage nephropathy were included by matching the onset time, gender, age, BMI and blood pressure of diabetes

Study data including numbers, clinical data, and corresponding CMR results, were shared every three months