TNM staging is commonly used for kidney cancer, and it is usually T1 or T2 stage if the tumor has not invaded the peritoneum, but the specific staging should be combined with the presence of metastasis to determine whether there is metastasis or not. According to the TNM staging criteria of kidney cancer, T1 stage: the tumor is confined to the kidney and the maximum diameter is ≤7cm; T2 stage: the tumor is confined to the kidney and the maximum diameter is >7cm, and when the kidney cancer invades the perinephric membrane or peripheral tissues outside the adrenal glands on the same side, it belongs to the T3 stage, therefore, the kidney cancer that does not invade the perinephric membrane is usually in the T1 or T2 stage. Therefore, kidney cancer without invading into the periphery is usually in T1 or T2 stage. The specific stage should be combined with whether there are lymph nodes and distant metastasis, if there are lymph nodes metastasis, it belongs to N1 stage, if there are distant metastasis, it belongs to M1 stage, if the kidney cancer has not invaded into the peripheral membrane, the tumor is less than 7cm, and there are lymph nodes and distant metastasis, the final stage will be T1N1M1. Regardless of the stage of kidney cancer, one should go to regular hospitals in time and follow the doctor’s advice for treatment.