The examination of kidney disease includes the following: 1. Urinalysis: Urinalysis may show proteinuria, hematuria, tubular urine, leukocyturia and bacteriuria. A urine protein quantification of more than 150mg per day or a positive urine protein qualitative test can be called proteinuria. The causes of proteinuria can be subdivided into physiological proteinuria, which has no organic lesions, and is commonly seen in functional proteinuria, which is seen in transient proteinuria caused by stressful conditions such as strenuous exercise, fever, and stress, and is mostly seen in adolescent urine qualitative tests, where the urine protein is usually no more than a plus sign. Postural proteinuria is commonly seen in adolescents during puberty, and can occur in upright and anterior spinal postures, and can disappear in the recumbent position, with a general protein excretion of <1 g/d. Glomerular proteinuria includes selective proteinuria and non-selective proteinuria. There are also tubular proteinuria and overflow proteinuria; 2. Blood tests: including routine blood, renal function, glomerular filtration rate, cystatin, to exclude secondary renal disease, also need to check complement C3, C4, about diabetes mellitus; 3. Imaging tests: imaging tests include ultrasonography, to understand the morphology, size and parenchymal echogenicity of both kidneys; ECT test to understand renal tubular There is also glomerular function; 4, kidney biopsy: in order to clarify the diagnosis, guide the treatment and judge the prognosis, if there is no contraindication, kidney puncture biopsy can be done.