Kidney injury is mainly divided into the following four categories: 1, renal contusion fracture, in general, this kind of injury pericardium intact, parenchyma also has no obvious big damage, just under the pericardium there is a certain amount of blood seepage and the amount is relatively small, generally conservative treatment can be cured; 2, kidney splitting injuries, this kind of renal injury of kidney injury pericardium has a part of splitting injury as well as renal parenchyma has some damage, bleeding than renal contusion fracture to a larger amount. A part of it can be treated conservatively, and a part of it needs surgical treatment; 3, total renal fracture, this kind of injury generally has damage to both renal periphery and renal parenchyma, and may also contain renal pelvis and calyx injuries, which may be accompanied by peripelvic, hematuria, and perirenal effusion, etc.; 4, kidney tip injury, which is mainly the damage to the renal blood vessels and renal arteries and veins.