Renal contusion can be detected by color ultrasound, and renal ultrasound can indicate the location and degree of renal contusion, the presence of subperitoneal and perirenal hematoma, urinary extravasation, other organ trauma and contralateral kidney. If the renal contusion is only limited to part of the renal parenchyma, forming renal petechiae and/or subperitoneal hematoma, the ultrasound shows that the peritoneum is intact and separated from the parenchyma, and the hematoma shows a non-echoic area, and the internal scattered small spot echoes can be seen with a sense of floating; urine extravasation shows a retroperitoneal liquid dark area; accompanied by other organ damage can be seen to varying degrees of hemorrhage and structural abnormality. Renal contusion can appear microscopic hematuria or mild hematuria of the naked eye; subperitoneal hematoma, perirenal soft tissue trauma, bleeding or urinary extravasation can cause lumbar and abdominal pain on the sick side. If the lumbar region is impacted by an external force and symptoms such as pain in the renal region and hematuria occur, one should be alert to the possibility of renal contusion. Renal contusion patients are advised to go to regular hospitals as soon as possible, under the guidance of physicians for standardized treatment, so as not to delay the condition.