The widespread use of imaging techniques such as ultrasound, CT and MRI has led to the incidental detection of a large number of small confined renal cancers, which are often small in size, slow in growth and low in metastatic potential. With the continuous development of laparoscopic techniques and instruments, McDougall et al. reported laparoscopic renal unit preserving surgery for the first time in animal experiments in 1993, and since then laparoscopic renal unit preserving surgery has been mastered by more and more units, and even for central renal cancer, some authors have tried to apply laparoscopic renal unit preserving surgery. Control of bleeding, complete removal of tumor, and maximum protection of renal function are the keys to laparoscopic renal unit preservation surgery. During open surgery to preserve the renal unit, blood flow to the kidney can be temporarily blocked while ice chips are placed around the kidney for cooling to protect renal function, and some authors have tried to take some cooling measures to protect renal function while blocking the renal tip during laparoscopic surgery, but they are more difficult to implement. There are currently 2 options for laparoscopic preservation of the renal unit: intraoperative blocking of the renal tip or no blocking of the renal tip. The advantage of blocking the renal tip is that the intraoperative view is clear and the location and boundary of the renal tumor can be clearly identified, which is conducive to accurate tumor removal; the disadvantage is that because it is exceptionally difficult to cool the kidney laparoscopically (although some authors have been trying intraoperative cooling methods), the operator is required to complete the tumor removal and suture of the renal wound in a short time (it is usually considered that the renal thermal ischemia time should be limited to 30 minutes), and The laparoscopic suturing of the kidney requires a high level of technical skill, which will certainly cause great psychological challenges and stress to the operator, and may have irreversible effects on the kidney function if not handled properly. The advantage of not blocking the nephron is that the tumor can be removed more easily during the operation, and the subsequent hemostatic suturing can be performed when the kidney has blood supply, which is not too demanding on the operation time; the disadvantage is that when the tumor is removed, the bleeding can cause blurred vision and make the boundary between the tumor and normal kidney tissue become blurred, so effective hemostatic means can help a lot to continue the operation. At present, there are several intraoperative means of hemostasis, including ultrasonic knife, bipolar electrocoagulation, monopolar electric knife, microwave knife, TissueLink, green laser, holmium laser, radiofrequency ablation probe, high-pressure waterjet, etc. However, once the above methods still cannot effectively stop bleeding, the renal tip should be blocked in time to ensure complete tumor removal. The method of laparoscopic kidney unit preservation surgery should be determined according to the specific situation of the unit and the operator.