Bi-Kidney Vascular Ultrasound focuses on the arteries and veins of the kidneys. The renal arteries of both kidneys originate from the abdominal aorta, which enters the kidneys from the medial and central part of the kidneys, that is, the renal hilum, and the renal veins of both kidneys originate from the inferior vena cava, which also enters the kidneys from the renal hilum. The distribution of blood vessels in both kidneys is very rich, and it is called the vascular tree because it is shown as a dendrite with color Doppler. When observing the renal arteries with color ultrasound, it is important to observe whether the wall lining of the arteries is smooth, whether the inner diameter of the lumen is normal, and whether the blood flow rate in the lumen is normal. When there is stenosis in the renal arteries, the patient develops high blood pressure, which is difficult to control clinically with medications. When there are occupying lesions in the kidneys, it is necessary to observe whether there is any tumor thrombus in the veins of the kidneys and whether there is any blockage of the renal veins, which provides a great help to the clinician’s diagnosis and treatment. Dual kidney vascular ultrasound is economical, convenient, non-traumatic, painless, and widely used in clinical practice.