With the widespread use of modern imaging technology and routine physical examinations, the number of incidental renal tumors (less than 4 cm) detected at an early stage has increased, and laparoscopic partial nephrectomy is gradually being performed in medical centers where it is available, and laparoscopic partial nephrectomy with preservation of the renal unit has gradually developed into a more mature technique. Laparoscopic partial nephrectomy with preserved renal unit can be accomplished through the abdominal and retroperitoneal routes. The Cancer Hospital of Sun Yat-sen University has been performing laparoscopic partial nephrectomy since 2015, and more than 60% of renal cancers have undergone partial nephrectomy in the past five years, and we are able to perform two different routes, which has expanded the indications for laparoscopy. We believe that tumors in the ventral and lower pole of the kidney are more easily accomplished through the ventral route, and the transretroperitoneal route is more suitable for upper pole and dorsal tumors. Precautions: CT films should be read carefully before surgery, and CT digital reconstruction of blood vessels should be performed as much as possible if possible to understand the renal artery course and branch blood supply and to guide the renal artery freeing during surgery to avoid incomplete blockage and insufficient clarity of the operative field, which may affect the complete resection of the tumor. For most renal parenchymal incisions deeper than 2 cm, at least two layers of sutures should be performed to avoid incomplete hemostasis and excessive tension and to reduce the risk of postoperative bleeding and urinary leakage. In some cases, the tumor invades the renal parenchyma too deeply or the resection process cuts through the renal collecting system, which should be sutured separately to stop bleeding or repair to avoid postoperative leakage or secondary bleeding. The outermost suture can be closed with a continuous suture assisted by a Hem-o-lock clip to simplify the procedure and save time. Most of the secondary postoperative bleeding can be stopped by selective renal artery embolization when conservative treatment is ineffective.