Inclusion Criteria:  patients with clinical diagnosis of T2DM and DKD were enrolled. patients with clear B mode ultrasound imaging in both side of kidney (left and right). No missing value in the vital clinical data such as eGFR and UACR.  Exclusion Criteria:  Patients with large kidney space occupying disease such as kidney renal cyst and tumor were excluded. Ultrasound images with severe shadow or incomplete kidney border were excluded.