The diagnosis of pyelonephritis is usually based on clinical symptoms and urine test, blood culture test, ultrasound is only an auxiliary examination, ultrasound is mainly to do ultrasound of the urinary tract to see if there is any morphological change in the urinary tract, i.e., kidneys, renal pelvis, calyxes, ureters, bladder, etc. The main purpose of ultrasound is to see if there is any change in the shape of urinary tract. The diagnosis of pyelonephritis is mainly based on whether the patient has clinical symptoms, such as fever, lumbar pain, urinary frequency, urinary urgency, urinary pain, burning sensation of urination, difficulty in urination, and some people will have hematuria, and further urine examination is that urine routine can see urine red blood cells, white blood cells, and positive bacteria, and the urine culture can be cultured for bacteria. Therefore, ultrasound is only an auxiliary examination to rule out the presence of urinary tract abnormalities or stones and other high-risk factors, and the diagnosis still needs to depend on the symptoms and the results of the urine test.