Kidney cancer can be detected mainly through two ways: the first way: accidental ultrasound detection during routine physical examination of the unit or when you consult other diseases; the second way: when symptoms such as hematuria, lumbar pain and lumps appear and then consult the hospital. About 70% of the kidney cancers detected so far are found through the first route, and most of the kidney cancers detected through this route are early stage kidney cancers. Most of the kidney cancers detected through the second route have obvious symptoms and are middle to late stage kidney cancers, which are more common in less developed medical areas. The nature of kidney tumors detected by ultrasound through the above channels is mainly clarified by enhanced CT or MRI of kidney. At present, most of the substantial kidney tumors can be clarified by enhanced CT to determine the benign and malignant nature of tumors, while some cystic kidney tumors need to be clarified by other imaging examinations. However, 5%-10% of renal tumors are not easily identified by imaging, and even misdiagnosed by these examinations. Therefore, the nature of kidney tumor should be determined by pathological section after resection. Intravenous pyelogram or retrograde pyelogram, radionuclide examination and arteriogram are auxiliary methods to diagnose renal tumor, but they are less used nowadays.