Laparoscopic kidney unit preserving surgery for kidney cancer With the widespread use of imaging, the diagnosis rate of kidney tumors has increased by 13-27%. LNSS (kidney unit preserving surgery) can ensure good tumor-free survival while preserving the function of the affected kidney as much as possible, and is the standard surgical procedure for the treatment of renal tumors smaller than 4 cm. The transabdominal route is mostly used in foreign medical units, while the retroperitoneal route is mostly used in domestic hospitals. The indications for kidney unit preservation surgery can be divided into three categories: absolute indications, relative indications, and selective indications, and the indications for LNSS have been greatly expanded in recent years. LNSS can be divided into two types: partial nephrectomy without ischemic resection and partial nephrectomy with renal hilum block, the former refers to the gradual resection and hemostasis to complete the surgery without hilum block, the latter refers to the temporary blockage of renal blood supply to complete the renal The latter refers to partial resection of the kidney within a certain period of time, including thermal ischemic block and cold ischemic block. The operator needs to have the foundation of open surgery and conventional laparoscopic surgery, and LNSS will have a broad space for development in the context of gradually increasing incidence of small kidney cancer.