1.B-type ultrasonography: It can know the size and shape of kidney, whether there are stones, tumors, cysts, hydronephrosis, urinary tract obstruction, congenital anomalies and other lesions. 2, Renal map and renal dynamic imaging: to understand the renal blood flow of the left and right kidneys, glomerular filtration function, renal excretory function, as well as suggesting the presence or absence of renal artery stenosis. 3.Intravenous pyelogram: observe the structure and function of each organ of urinary system, and understand the characteristics and nature of lesions in urinary tract. 4.Renal CT and Magnetic Resonance Imaging (MRI): CT and MRI can find out the tiny calcification and stones which cannot be detected by ordinary X-ray. At the same time, they can determine the location and nature of renal lesions or congenital developmental abnormalities. It can also assist in the diagnosis of renal tumors, renal tuberculosis, renal cysts, etc. MRI’s higher resolution and minimal damage to the human body are its main advantages.