1.Pre-operative preparation, after renal artery embolization, the tumor shrinks, perirenal edema, which is conducive to the resection of the kidney and reduce intraoperative bleeding. 2.It is convenient to ligate the renal artery and vein first during surgery to reduce the spread of tumor cells. 3.For huge tumors that are difficult to be removed, arterial embolization can lead to shrinkage of kidney, thus increasing the chance of surgical resection. 4.Treatment of hemorrhage caused by renal cancer. 5.Palliative embolization treatment.