AKI is also known as Acute Kidney Injury (AKI) in medicine. Acute Kidney Injury (AKI) refers to the impairment of kidney function in a short period of time, which is not more than three months. Including can be diagnosed or judged by the blood of kidney function, urine routine, imaging changes. The current definition of acute kidney injury is the absolute value of elevated blood creatinine, which is greater than 25mmol/L or 0.3mg/dl or elevated blood creatinine value, which is greater than 50% compared to the previous one, or the urine volume is significantly reduced, and the urine volume is less than 0.5ml per kilogram of body weight per hour and the time is more than 6 hours. This is one of the criteria for the diagnosis of acute kidney injury.